Can you tell me the answers of 4,5,6,7 
Please explain the methods of all the sums not the answers only.:


6. What is the least number which when decreased by 9 is divisible by each of the numbers 72, 96 and 160? 

7. Find the largest number that Will divide 399. 440 and 550 leaving remainders 8, 15 and 23 respectively. 

Question 4)9+99+999+9999=91+11+111+1111      ...[taking 9 common]=9×1234=11106Question 5)We know that,Dividend =divisor×quotient+remainder73855=27×Q+1073855-10=27Q73845=27Q7384527=Q           2735      2773845      -54            19 8         -189                94              -81                  135            -135                  0thus the quotient is 2735      
Regards

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