exam Maths Puzzle Numerical Ability

Find the area of the triangle
One leg is 7 inches and the hypotenuse is 20 inches and the perimeter is 12 inches.

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exam Other Question
Solve each system by the addition method:

x/3 - y/2 = -5/6

x/5 - y/3 = -3/5 please help me solve this equation, i know this is an easy problem but i have to make sure its right.

.2r=68

i divided 68 by 2 and got 340 and that dosent seem right to me