Question

10. How many litres of pure alcohol is to be added to 40 litres of
20% alcohol solution to obtain a mixture which is 36%
alcohol.
(a) 10 litres
(b) 12 liters
(c) 15 liters
(d) 5 liters
(e) None of these​

Answer 1

Answer:

5

Step-by-step explanation:

and Mark's me .....,.............................

Answer 2

Answer:

10 litres

Step-by-step explanation:

40 litres of a solution contain 20%

alcohol is 40×20/100=8 litres, remaining 32

@

according to question

alcohol to make % is 36%

so remaining compound is64%

64%=32

36%=?

cross multiply above

32×36/64=18 litres alcohol

already 8 litres is given

18-8=10 litres