Algebra Q#7

77Anita bought some pencils, erasers and graph papers from a stationary shop. If the ratio of the pencils and the erasers is the same as that of erasers and graph papers and she bought 10 pencils and 40 graph papers. Find the number of eraser bought by her.

Option : A
Explanation : Let number of eraser be x, then 10 : x = x : 40 ⇒ 10/x = x/40 ⇒ x ²= 40 × 10 = 400.⇒ x = 20

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