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Answer 1 · 2018-03-12T08:48:43

(C) $27.5%$ acid

In $1$ liter of $40%$ acid we have $40/100$ liter of acid, so in $15$ liter of $40%$ acid, we will have

$40/100xx15=600/100=6$ liters of acid.

Similarly, in $1$ liter of $20%$ acid we have $20/100$ liter of acid, so in $25$ liter of $20%$ acid, we will have

$20/100xx25=500/100=5$ liters of acid.

Therefore in $15+25=40$ liters of mix, we have $6+5=11$ liters of acid

and in $1$ liter, we have $11/40$ liters of acid i.e.

$11/40xx100=11xx2.5=27.5%$ acid and answer is $(C)$