The HCF and LCM of two numbers are 9 and 90 respectively. If one number is 18, find the other.
We know that,
HCF x LCM = Product of 2 numbers - - - - - - - - - - (1)
Here,
HCF = 9
LCM = 90
1st number = 18
2nd number = Y
Substituting the values given above in the equation (1)
9 x 90 = 18 x Y
810 = 18 x Y
Y = 810 / 18
Y = 45
Therefore the second number is 45