23
Q:

A container contains 40 litres of milk.From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container.

A) 26.34 litres B) 27.36 litres
C) 28 litres D) 29.16 litres

Answer:   D) 29.16 litres

Explanation:

Amount of milk left after 3 operations

 litres

Q:

A Container has a capacity of 48 litres and is full of milk. 4 liters of milk is taken out of it and replaced by same quantity of water. Again 4 liters of the mixture is taken out and replaced by the same quantity of water . The process is repeated five times. How much milk is left in the mixture ?

Answer

 = 



Milk left in the container = 



 =  liters

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8 465
Q:

In what proportion water must be added to spirit to gain 20% by selling it at the cost price ?

Answer

Let the C.P of spirit be = Rs.10 per litre


S.P of the mixture = Rs. 10 per litre


Profit = 20


 C.P of the mixture = Rs.  = Rs.  per litre




Ratio of water and spirit = 1 : 5

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4 1242
Q:

A sum of Rs.118 was divided among 50 boys and girls such that each boy received Rs.2.60 and each girl Rs.1.80. Find the number of boys and girls ?

Answer

Average money received by each =  = Rs. 2.36



Ratio of No.of boys and girls = 56 : 24 = 7 : 3


 Number of boys =  = 35


Number of girls = 50 - 35 = 15

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10 912
Q:

A man travelled a distance of 80 km in 7 hours partly on foot at the rate of 8 km per hour and partly on bicycle at 16 km /hr. Find the distance travelled on foot ?

Answer



Thus out of 7 hrs in all, he took 4 hrs to travel on foot 


 Distance covered on foot in 4 hrs = ( 4 x 8) = 32 km

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6 1031
Q:

In what ratio should two varieties of tea at Rs. 60 per kg and Rs.120 per kg be mixed together so that by selling the mixture at Rs.96 per kg, a profit of Rs.20% is obtained ?

Answer

Let us first calculate the cost of price of the mixture. the selling price of the mixture is given as Rs.96 and the profit is given as 20%. So, Cost price =  = Rs. 80


Now, let us apply allegation method :



= 40 : 20 =  2 : 1

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7 275