Question

The average weight of a class of 40 students is 30 kg and that of a class of 20 students is 15 kg. Find the average weight of both the classes combined.

Correct
option
is 25

#file_1630941977790

#file_1630941977790

Question

A merchant has 1000 kg of sugar, part of which he sells at 8% profit and the rest at 18% profit. He gains 14% on the whole, The quantity sold at 18% profit is -

Correct
option
is 600 kg

#file_1634486584030

#file_1634486584030

Question

8 liters of water is added to 32 liters of a solution containing 20% alcohol. Now what is the approximate percentage of alcohol in this solution?

Correct
option
is 16%

In 32 liters of solution, alcohol $=\dfrac { 32\times 20}{100}= 6.4$ liter on adding 8 liters of water, the required percentage $\dfrac {6.4 }{ 40}\times100 = 16$%

In 32 liters of solution, alcohol $=\dfrac { 32\times 20}{100}= 6.4$ liter on adding 8 liters of water, the required percentage $\dfrac {6.4 }{ 40}\times100 = 16$%

Question

Three liters of sugar solution contains 60 percent sugar. If one liter of water is added to this solution, then what will be the percentage of sugar in the new solution?

Correct
option
is 45

Sugar in 3 liters of mixture $\dfrac {60 }{ 100 }\times 3= 1.8$ liter In mixture by adding one liter of water = 4 liters 4 liters mixture in which sugar % $= \dfrac {1.8}4\times 100= 45 $%

Sugar in 3 liters of mixture $\dfrac {60 }{ 100 }\times 3= 1.8$ liter In mixture by adding one liter of water = 4 liters 4 liters mixture in which sugar % $= \dfrac {1.8}4\times 100= 45 $%

Question

Spirit and water in a mixture are in the ratio 3 : 2. If it contains 3 liters more spirit than water, then the quantity of spirit in the mixture is -

Correct
option
is 9 liters

Spirit : Water =3 : 2 1 Unit = 3 L. [1 unit more than spirit and water] 3 units = 3 x 3 = 9 liters

Spirit : Water =3 : 2 1 Unit = 3 L. [1 unit more than spirit and water] 3 units = 3 x 3 = 9 liters

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