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Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 10)
The ratio of the number of cows to sheep on a farm is 3:7. If there are 21 cows, how many sheep are there?
7
35
49
63
Explanation
Cows:Sheep=3:7, 21 cows is 3*7. so 7*7 = 49
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