A scientist prepares a mixture with two chemicals; chemical 1 and chemical 2 in proportion of 2 : 3 and makes a total concoction of 150 ml. How many ml of chemical 1 has been used?
60
The correct answer is 60.
If the total volume was 120 ml, the volume per part would be $120/6 = 20$ ml/part. The volumes would then be A = $1 \times 20 = 20$ ml, B = $2 \times 20 = 40$ ml, and C = $3 \times 20 = 60$ ml. This method is widely applicable whenever quantities of components in a mixture are given as a ratio and the total quantity of the mixture is known.
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