Question

Can you explain as well? There's a picture below!

Answer 1

(C) `27.5%` acid

Explanation:

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)`