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Mathematics for IGCSE & O level - Ratio And Proportion (Section 1 - No. 44)

A shop sells pens and pencils in the ratio 3:7. If it has 21 pens, how many pencils does it have?
7
35
49
147

Selitys

Pens:Pencils=3:7. 21 pens is 3*7. 7*7 = 49 pencils

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