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Mathematics for IGCSE & O level - Ratio And Proportion (Section 5 - No. 39)

If the price of 3 apples is $1.80, what is the cost of 7 apples?
$3.60
$4.20
$4.50
$5.40

Giải thích

Price per apple = $1.80/3 = $0.60. Cost of 7 apples = $0.60 * 7 = $4.20

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