Question
In a 120-litre chemical mixture, the chemicals A and B
are in the ratio 5:7. How much of chemical A must be added to make the ratio 7:7 (i.e., equal amounts)?Solution
ATQ,
Quantity of A = (5/12) × 120 = 50 litres
Quantity of B = (7/12) × 120 = 70 litres
Let the amount of A to be added be x litres
Then, (50 + x) : 70 = 7 : 7
So, 50 + x = 70
x = 70 - 50 = 20 litres
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