Question

DDT
26. Ram prepares solutions of alcohol in water according to customer's needs. This morning Ram has prepared 27
litres of a 12% alcohol solution and kept it ready in a 27 litres delivery container to be shipped to the customer.
Just before deliver, he finds out that the customer had asked for 27 litres of 21% alcohol solution. To prepare
what the customer wants, Ram replace a portion of 12% solution by 39% solution. How many litres of 12%
solution are replaced?
(a)s
(b)9
(0)10
(d)12
(e)None of these
​

Answer 1

Direct solution

( 27-x)X12+39x=27 × 21

324-12x +39x=567

27x = 233

X= 9L

Answer 2

27*12/100=3.24

27*88/100=24.76

27*21/100=5.67