41.
The average age of a family of 5 members is 20 years. If the age of the
youngest member be 10 years then what was the average age of the family at the
time of the birth of the youngest member?
a)
13.5 b) 14 c)15 d) 12.5
42.
Average cost of 5 apples and 4 mangoes is Rs.36. The average cost of 7 apples
and 8 mangoes is Rs.48. Find the total cost of 24 apples and 24 mangoes.
a)
Rs.1044 b) RS.2088 c)Rs.720 d) Rs.324
43.
Tea worth Rs. 126 per kg and Rs. 135 per kg are mixed with a third variety in
the ratio 1 : 1 : 2. If the mixture is worth Rs. 153 per kg, the price of the
third variety per kg will be:
a)
Rs. 169.50 b) Rs. 170 c) Rs. 175.50 d) Rs. 18
44.
A vessel is filled with liquid, 3 parts of which are water and 5 parts syrup.
How much of the mixture must be drawn off and replaced with water so that the
mixture may be half water and half syrup?
a)
1/3 b) 1/4 c) 1/5 d) 1/7
45. In what proportion must weat at
Price 4.10 per kg must be mixed with weat at Price 4.60 per kg, so that the
mixture be worth Rs 4.30 a Kg ?
View Answer and Explanation:
46. How many kg of rice at Rs. 60 per
kg, must be be mixed with 30 kg of rice at Rs 25 per kg, so that he may on
selling the mixture at Rs 50 per kg gain 25 % on the outlay ?
View Answer and Explanation:
47. A mixture of certain quantity of
milk with 20 liters of water of worth Rs 10 per liter. If pure milk is of worth
Rs 15 per liter, how much milk is there in the mixture ?
View Answer and Explanation:
48. In what proportion must water be
mixed with milk to gain 20 % by selling it at cost price ?
49. Milk and water are mixed in a
vessel A in the ratio 5 : 3 and in vessel B in ratio 9 : 7 . In what ratio
should quantities be taken from the two vessels so as to form a mixture in
which milk and water will be in the proportion of 7 : 5 ?
View Answer and Explanation:
50. A goldsmith has two qualities of
gold, one of 10 carats and another of 15 carates purity. In what proportion
should he mix both to make an ornament of 12 carats purity ?
View Answer and Explanation:
