Question

A number is divided by 10 gives a remainder 7. If the same number is divided by 5, then what will be the remainder?​

Answer 1

Answer is 2. If division by 10 gives a remainder of 7 then it's units digit is 7. Subtracting 2 yields a number with units digit of 5 which is a multiple of 5. So dividing the number by 5 yields a remainder of 2.