What is the sum of all three-digit numbers which are divisible by 20?

Select the number triad that is analogous to the given triads.
 (64, 8, 65), (125, 27, 89)

In a school $${1\over10} $$ of the boys are same in number as $${1\over4}$$ of the girls and  $${5\over8} $$ of the girls are same in number as $${1\over4}$$   of the boys. The ratio of the boys to girls in that school is: 

When the integer n is divided by 7, the remainder is 3. What is the remainder if 5n divided by 7?

Let x be the least number of 4 digit that when divided by 2, 3, 4, 5, 6 and 7 leaves a remainder of 1 in each case. If x lies between 2000 and 2500, then what is the sum of the digits of x?

If a 7-digit number 54p3987 is divisible by 11 , then p is equal to:

A number when divided by 119, leaves a remainder of 19. If it is divided by 17, it will leave a remainder of: 

Direction : What value should come in the place of question mark (?) in the following questions?

23 × 45 ÷ 15=?