exam Maths Puzzle Numerical Ability

if one hand equals 4 inches, find the height in feet of a horse that is 16.2 hands`(1 ft= 12 inches)

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exam Other Question

A man has twenty coins consisting of dimes and quarters. If the dimes were quarters and the quarters were dimes he would have 90 cents more than he has now. How many dimes and quarters does he have.

.10x+.25y=z
.25x+.10y=z+.90

I am stuck. The difference between the measures of 2 complementary angles is 36 degreees.Find both angle measures.(Hint:2 angles are complementary if the sum of their measures is 90 degrees.)LINEAR EQUATIONSSS!