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Explanation & Answer
Let solution A = A litres, 13% alcohol, used 4 times
Let solution B = B litres, 10% alcohol,
Clearly since solution A is 4 times to that of B solution hence, solution A will be 4B litres
13% of 4B + 10% of B = 124
52/100 B + 1/10 B = 124
53 / 100 B = 124
B = 12400/53
B = 234 mili litres
She used 234 mili litres of Alcohol B.
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