i want answers for book oxford new enjoying mathematics chapter no 5 playing with numbers ex 5.3

ahmed buys a plot of land of rs 96000 he sells 2/5 of it at loss of 6 percent , at what gain percent should he sell the remaining part of the plot to gain 10 percent on the whole ?

in two digit number, the digit at the units place is double the the digit in the tens place. the number exceeds the the sum of its digit by 18 .find the number.

IQ LVL TEST.

Complete the pattern :

0, 6, 24, 60, 120, 210, ?

the sum of the digits of the two digit number is 15.the number obtained by interchanging its digits exceeds the given number by 9. find the original number.

If 24x is a multiple of 3, where x is a digit, what is the value of x?

(Since 24x is a multiple of 3, its sum of digits 6 + x is a multiple of 3; so 6 + x is one of these numbers: 0, 3, 6, 9, 12, 15, 18…. But since x is a digit, it can only be that 6 + x = 6 or 9 or 12 or 15. Therefore, x = 0 or 3 or 6 or 9. Thus, x can have any of four different values)

A] find all possible values of x for which the number 7x3 is divisible by 3 . also find each such number.

B] find all possible values of y for which the number 53y1 is divisible by3 .also find each such number.

rn

1. Write a 2-digit number ab and the number obtained by reversing its digits i.e., ba. Find

their sum. Let the sum be a 3-digit number dad i.e., ab + ba = dad

(10a + b) + (10b + a) = dad

11(a + b) = dad

The sum a + b can not exceed 18 (Why?).

Is dad a multiple of 11?

Is dad less than 198?

Write all the 3-digit numbers which are multiples of 11 upto 198.

Find the values of a and d.

3. If 21y5 is a multiple of 9, where y is a digit, what is the value of y?

4. If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that

there are two answers for the last problem. Why is this so?

5. If 24x is a multiple of 3, where x is a digit, what is the value of x? (Since 24x is a

multiple of 3, its sum of digits 6 + x is a multiple of 3; so 6 + x is one of these numbers:

0, 3, 6, 9, 12, 15, 18, ... . But since x is a digit, it can only be that 6 + x = 6 or 9 or 12

or15. Therefore, x = 0 or 3 or 6 or 9. Thus, x can have any of four different values.)

6. If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?

-20 = -20

16-36= 25-45

16-36 +(9/2)= 25-45 +(9/2) (adding 9/2 on both sides)

(4-9/2) (4-9/2)= (5-9/2) (5-9/2) (by a-b whole square formula)

4=5 (-9/2 = -9/2 )

where 4 is not = 5 find out mistake

A246

52B7

ANS ICDE

HOW TO SUBTRACT

In a division sum, the divisor is 12 times the quotient and 5 times the remainder. If the remainder is 48 then what is the dividend?

please explain by solving .

what is the divisibility test of 7?

in a 3-digit number, the tens digit is thrice the units digit and the hundreds digits is four times the units digits.also, the sum of its digits is 16. find the number.

without doing actual division, find the remainder when;

also write the steps to find the ans.

i want answers for book oxford new enjoying mathematics chapter no 5 playing with numbers ex 5.3

ahmed buys a plot of land of rs 96000 he sells 2/5 of it at loss of 6 percent , at what gain percent should he sell the remaining part of the plot to gain 10 percent on the whole ?

in two digit number, the digit at the units place is double the the digit in the tens place. the number exceeds the the sum of its digit by 18 .find the number.

IQ LVL TEST.Complete the pattern :

0, 6, 24, 60, 120, 210, ?

the sum of the digits of the two digit number is 15.the number obtained by interchanging its digits exceeds the given number by 9. find the original number.

Find the value of A,B,C.

If 24

xis a multiple of 3, wherexis a digit, what is the value ofx?(Since 24

xis a multiple of 3, its sum of digits 6 +xis a multiple of 3; so 6 +xis one of these numbers: 0, 3, 6, 9, 12, 15, 18…. But sincexis a digit, it can only be that 6 +x= 6 or 9 or 12 or 15. Therefore,x= 0 or 3 or 6 or 9. Thus,xcan have any of four different values)102-1=99

how is it possible?

A] find all possible values of x for which the number 7x3 is divisible by 3 . also find each such number.

B] find all possible values of y for which the number 53y1 is divisible by3 .also find each such number.

rn

1. Write a 2-digit number ab and the number obtained by reversing its digits i.e., ba. Find

rntheir sum. Let the sum be a 3-digit number dad i.e., ab + ba = dad

rn(10a + b) + (10b + a) = dad

rn11(a + b) = dad

rnThe sum a + b can not exceed 18 (Why?).

rnIs dad a multiple of 11?

rnIs dad less than 198?

rnWrite all the 3-digit numbers which are multiples of 11 upto 198.

rnFind the values of a and d.

rn3. If 21y5 is a multiple of 9, where y is a digit, what is the value of y?

rn4. If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that

rnthere are two answers for the last problem. Why is this so?

rn5. If 24x is a multiple of 3, where x is a digit, what is the value of x? (Since 24x is a

rnmultiple of 3, its sum of digits 6 + x is a multiple of 3; so 6 + x is one of these numbers:

rn0, 3, 6, 9, 12, 15, 18, ... . But since x is a digit, it can only be that 6 + x = 6 or 9 or 12

rnor15. Therefore, x = 0 or 3 or 6 or 9. Thus, x can have any of four different values.)

rn6. If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?

rn-20 = -20

16-36= 25-45

16-36 +(9/2)= 25-45 +(9/2) (adding 9/2 on both sides)

(4-9/2) (4-9/2)= (5-9/2) (5-9/2) (by a-b whole square formula)

4=5 (-9/2 = -9/2 )

where 4 is not = 5 find out mistake

A246

52B7

ANS ICDE

HOW TO SUBTRACT

In a division sum, the divisor is 12 times the quotient and 5 times the remainder. If the remainder is 48 then what is the dividend?

please explain by solving .

what is the divisibility test of 7?

in a 3-digit number, the tens digit is thrice the units digit and the hundreds digits is four times the units digits.also, the sum of its digits is 16. find the number.

without doing actual division, find the remainder when;

also write the steps to find the ans.