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Mathematics for IGCSE & O level - Ratio And Proportion (Section 5 - No. 10)

If 4 pens cost $6, how much will 10 pens cost?
$12
$15
$18
$20

Explication

Each pen costs $6/4 = $1.50. Therefore 10 pens = 10 * 1.50 = 15

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