Delhi Police Constable Exam Model Paper 9

Tips & Tricks
If a number is divided by 30 then it leaves 17 as a remainder
∴ The number is
= 30n + 17, n is a natural number
= 30n + 10 + 7
= 10(3n + 1) + 7
∴ 7 will be the remainder when the same number is divided by 10