book Maths Puzzle Numerical Ability

The formula A=2h(l+w) gives the lateral area A of a rectangle solid with length l, width w, and height h.

Q. Solve this formula for h.

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book Other Question

i need help with these problems as well please.

x(y+12) divided by 10 (x-y) x=5 and y=-3

would you just plug in 5 for x and -3 for y and you would get 9/16??
The ratio of spaniels to poodles at the dog show was 5 to 7.If there were 35 spaniels at the dog show, how many poodles were there?(the possibilities are.........35, 49, 25, or none of these)