Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 15)
If 5 identical boxes weigh 35 kg, how much do 3 of these boxes weigh?
15 kg
21 kg
25 kg
28 kg
Explanation
Each box weighs 35/5 = 7 kg. 3 boxes will weigh 3*7 = 21 kg
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