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Q11. Zinc and copper are in the ratio of 5:3 in 200 gm of an alloy.
How much grams of copper be added to make the ratio as 3:5?
a) 400/3 b) 1/200 c) 72 d) 66
Q12. The students in three classes are in the ratio 2:3:5. If 40 students
are increased in each class, the ratio changes to 4:5:7. Originally,
the total number of students was:
a) 100 b) 180 c) 200 d) 400
Q13. In 30 litres mixture of acid, the ratio of acid and water is 2:3.
What amount of water should be added to the mixture so that the ratio of
acid and water becomes 2:5?
a) 10 litres b) 15 litres c) 19 litres d) 12 litres
Q14. The product of two positive integers is 1575 and their ratio is 9:7.
The smaller integer is
a) 25 b) 35 c) 45 d) 70
Q15.In an alloy, the ratio of copper and zinc is 5:2. If 1.250 kg of zinc
is mixed in 17kg500 g of alloy, then the ratio of copper and zinc will be
a) 2:1 b) 2:3 c) 3:2 d) 1:2
Q16. The ratio of the number of boys to that girls in a group becomes 2:1
when 15 girls leave. But, afterwards, when 45 boys also leave, the ratio
becomes 1:5. Originally the number of girls in the group was
a) 20 b) 30 c) 40 d) 50
Q17. If b is the mean proportional of a and c , then (a-b)3 : (b-c)3 equals
a) a3 : c3 b) b2 : c2 c) a2 : c2 d) a3 : b3
Q18. Same quantity of rice is required for each member of a family of 15 members.
On a particular day, due to the absence of some members of the family,
the consumption of rice was reduced in the ratio 5:3. The number of members absent on that day was
a) 3 b) 6 c) 8 d) 9
Q19. The ratio of the first and second class train fares between two stations
is 3:1 and that of the numbers of passengers travelling between the two stations
by first and second classes is 1:50. If on a particular day, Rs 1,325 are collected
from passengers travelling between the two stations, then the amount collected from
the second class passengers is
a) Rs 1,250 b) Rs 1,000 c) Rs 850 d) Rs 750
Q20. When a particular number is subtracted from each of 7,9,11 and 15, the resulting
numbers are in proportion. The number to be subtracted is:
a) 1 b) 2 c) 3 d) 5
Q21. A sum of Rs 86,700 is to be divided among A,B and C in such a manner that for every
rupee that A gets, B gets 90 paise and for every rupee that gets, C gets 100 paise. B’s
share will be
a) Rs 26,010 b) Rs 27,000
c) Rs 28,000 d) Rs 28,090
Answer key
11 a , 12 c ,13 d , 14 b , 15 a , 16 c , 17 d , 18 d , 19 a , 20 c , 21 b
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