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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)#