exam Maths Puzzle Numerical Ability

in math class your average grade for the first three tests is 81. You want to raise your final average to 85. What grade do you need on the final, the only remaing test in term?

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exam Other Question

Please help me solve this equation: one leg of a right triangle is 3 cm more than half the length of the other eg. the area of the triangle is 54cm^2. how long are each of the legs? Find the rate.

240 pounds fertilizer
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6 lawns
OK , do I divide 240 by 6 to find the ratio, or is there more to it than that?