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Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 6)

If 4 pens cost $3.20, how much would 7 pens cost?
$5.60
$6.40
$7.20
$8.00

توضيح

$3.20/4 = $0.80 per pen. $0.80 * 7= $5.60

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