The weights of 4 boxes are 70, 100, 20 and 40 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once. 

The ratio of the number of girls to the number of boys in a town is 90 %. If the total number of boys and girls in the town is 190, how many girls are in the town? 

If “S” denotes “multiplied by”, “V” denotes "subtracted from", "M" denotes "added to" and "L" denotes "divided by", then
96 L 8 S 4 V 16 M 9 = ?

If L=+, M= - , N = ×, P=÷ then 5 N 5 P 5 L 5 M 5 =?

There are deer and peacocks in a zoo. By counting heads they are 80. And the number of their legs is 200. How many peacocks are there? 

Your mother is 4 years younger than your father and your father is 6 times older than you. If you are 6 years old, what is your mother's age?

if 12 ( 20 ) 16 and 21 ( 35 ) 28, then what is value of A in 48 ( 80 ) A ? 

Identify the symbols to be inserted to make the expression correct.
24 Δ 4 Δ 5 Δ 4