book Maths Puzzle Numerical Ability

S= xs(R + s) for r

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book Other Question

The student-teacher ratio for Washington High was reported to be 27.5 to 1. If there are 42 teachers, then how many students are there? A steel rod. 31 cm. long is to be cut into 3 parts, two of which parts are to be of equal lengths. The lengths of each of the 2 equal parts is 5 cm. more than the third part. Find their lengths.