Next door to me are 4 brothers of different heights. Their average height is 74 inches and the difference among height of the first three men is 2 inches. The difference between the 3rd and the 4th brother is 6 inches. How tall is each brother?

1st 78, 2nd 76, 3rd 74, and 4th 68

(a+b+c+d)/4=74

a-2=b b-2=c c-6=d

a=78, b= 76, c=74, d=68

Add together three numbers each time to score 45.

Each number can be used as many times as you wish.

How many different combinations are there?

5 10 15 20 25

In a class there are 60 students who belong to Nightingale, Peacock and Parrot house. There are four times as many students in Parrot house as Nightingale house; and six more in Peacock house than Nightingale house. How many students are in each house?