Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 49)
A certain medicine requires a mixture of 1 part of a chemical and 5 parts of water. How much chemical is needed to be mixed with 15ml of water?
3ml
5ml
10ml
75ml
Explanation
Chemical:Water = 1:5. Since we use 15ml of water, this is 3 * 5. Thus the chemical would be 3 * 1 = 3ml
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