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Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 39)

A machine can produce 30 items in 12 minutes. At the same rate, how many items can it produce in 20 minutes?
40
50
60
70

Explicaţie

items/minute = 30/12 = 2.5. 2.5*20=50

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