book Maths Puzzle Numerical Ability

if two angles of a triangle are complementary find the number of degrees in the third angle of the triangle

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book Other Question

Bob sold hammers and wrenches at a flea market. He sold 4 times as many hammers as wrenches. The total sales equaled $609.00. If the hammers sold for $3.00 apiece and the wrenches for $2.50 each how many hammers and wrenches did he sell? A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?