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وارد شوید

Mathematics for IGCSE & O level - Ratio And Proportion (Section 5 - No. 24)

If 6 similar notebooks cost $9, how much will 10 notebooks cost?
$12
$13.50
$15
$16

توضیح

Cost per book is 9/6 = 1.50. 10*1.5 = $15

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