model 10 percentage with allegations & mixture Section-Wise Topic Notes With Detailed Explanation And Example Questions

Question : 1

If 4 litres of water is evaporated on boiling from 12 litres of salt solution containing 7 percentage salt, the percentage of salt in the remaining solution is

a) 13%

b) 10.5%

c) 11.5%

d) 12%

Question : 2

8 litres of water is added to 32 litres of a solution containing 20% of alcohol in water. What is the approximate concentration of alcohol in the solution now ?

a) 24%

b) 16%

c) 8%

d) 12%

Question : 3

A vessel has 60 litres of solution of acid and water having 80% acid. How much water be added to make it a solution in which acid forms 60% ?

a) None of these

b) 48 litres

c) 20 litres

d) 36 litres

Question : 4

One type of liquid contains 20% water and the second type of liquid contains 35% of water. A glass is filled with 10 parts of first liquid and 4 parts of second liquid. The water in the new mixture in the glass is

a) 24$2/7$%

b) 37%

c) 46%

d) 12$1/7$%

Question : 5

In an alloy there is 12% of copper. To get 69 kg of copper, how much alloy will be required ?

a) 1736$2/3$kg

b) 424 kg

c) 575 kg

d) 828 kg

Question : 6

15 litres of a mixture contains alcohol and water in the ratio 1 : 4. If 3 litres of Water is mixed in it, the percentage of alcohol in the new mixture will be

a) 18$1/2$%

b) 15%

c) 16$2/3$%

d) 17%