1.

Find the greatest number which will divide 25, 73 and 97 so asto leavr same remainder in each case

Answer»

If a number 'a' and a number 'b' are divisible by a number 'n' then, a+b and a-b is also divisible by n

=> LET the number be n which DIVIDES 62, 132 and 237 leaving a reminder R

=> the required number then becomes H.C.F of 62-r, 132-r and 237-r

=> it could also be the H.C.F of 
(132-r)-(62-r) and (237-r)-(132-r)

i.e. 70 and 105

=> H.C.F of 70 and 105 = 35

the required number n is 35.


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