3^2=4+5
(Note ^ refers to the power symbol)

5 men, 10 children and 20 women
If x = the number of men, then x + 2x + 4x =35
therefore 7x = 35
so x = 5

Zero, obviously

1 apple costs $0.18 and 1 banana costs $0.14.

From 36 blanks, 36 items are made. The lead shavings are enough to make 6 blanks, which make 6 more items. But don't stop here. The new shavings are good for 1 more item. Total: 43

25

65

125
96 passes out of 125 give an average of 76.8%

-2

Dimensions

C
The digits add up to 19. In all the others the total is 18.

C) 35.