Question

341 A shop ordered textbooks, notebooks, and pens in the ratio 5:3:1. If 20 textbooks were ordered,
how many pens were ordered?
29​

Answer 1

Answer:

Let Pencils = 10x, Pens = 2x & Exercise books = 3x. Now, 10x = 120 hence x = 12.

Number of exercise books = 3x = 36.

Answer 2

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Appropriate Question

A shop ordered textbooks ,notebooks,and pens in the ratio 5:3:1.If 20 textbooks were ordered,How many pens were ordered ?

Given

➢ Textbooks,Notebooks,and pens ordered by a shop are in ratio 5:3:1, respectively.

➢ Number of textbooks ordered = 20

To Find

➢ Number of pens ordered

Solution

➢ The ratio of the number of textbooks to the number of pens ordered is 5:1.

➢ Number of texbooks ordered : Number of pens ordered = 5 : 1.

➢ $\sf{ \frac{20}{number \: of \: pens \: ordered}} = \frac{5}{1}$

➢ $\sf{ \frac{20}{number \: of \: pens \: ordered}} = \frac{5 × 4}{1 × 4}$

➢ $\sf{ \frac{20}{number \: of \: pens \: ordered}} = \frac{20}{4}$

Hence,the number of pens ordered is 4.

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