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

Vysvětlení

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

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