निम्नलिखित

What should come in place of question mark (?) in the following questions? Find the exact value.

Sandeep can solve 20 questions in 1 hour. If he decreased his efficiency by 20%, then how much time would he take to solve the same number of questions?

Find the unit digit of the expression: 1! + 2! + 3! + 4! + 5! + ........ + 2027!.

Find the greatest number that divides 410, 545 and 680 leaving the same remainder in each case.

What is the largest common divisor of the numbers 1170, 2340, and 3510?

When a number is increased by 20% then the number obtained is 72 less than thrice the original number. Find the original number.

Find the range of the given data:

88, 76, 92, 85, 73, 66, 59, 95, 81

What is the highest possible sum of (m + n) if the number '9m813n2' is divisible by 12?