Ratio And Proportion

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11 The marks of 3 students A, B and C are in the ratio 10:12:15. If the maximum marks of the paper are 100, then the marks of B cannot be in the range of

A
20-30
B
40-50
C
70-80
D
80-90

12 Find the 4th proportional to 3,7 and 9:

A
18
B
20
C
21
D
24

13 If P : Q = 8:15, Q : R = 5: 8 and R : S = 4: 5, then P : S is equal to

A
4:15
B
2 : 15
C
3 : 19
D
7 : 15

14 If a : b = 3: 5 and b: c = 4: 7, then a : c is equal to

A
11:35
B
35:11
C
35:12
D
12:35

15 The total number of students in a school is 8670. If the number of boys in the school is 4545, then what will be the ratio of the total number of boys to the total number of girls in the school?

A
303 : 275
B
275 : 303
C
11 : 12
D
12 : 11

16 A sum of X 7000 is divided among A,B and C in such a way that the shares of A and B are in the ratio 2 : 3 and those of B and C are in the ratio 4: 5. The share of B is

A
₹ 1600
B
₹ 2000
C
₹ 2400
D
₹ 3000

17 The prices of a scooter and a television are in the ratio of 8 : 7. If a scooter costs ₹ 2000 more than a television, then find out the price of television:

A
₹ 14000
B
₹ 28000
C
₹ 10000
D
₹ 18000

18 What sum of money is to be divided among 3 persons in the ratio 3 : 4 : 7, so that the second person receives ₹ 12 only?

A
₹ 21
B
₹ 32
C
₹ 36
D
₹ 42

19 A sum of money is divided amongst A, B, C and D in the ratio of 3 : 7 : 9 : 13. If the share of B is ₹ 4872, then what will be the total amount of money of A and C together?

A
₹ 8352
B
₹ 6998
C
₹ 9784
D
₹ 7456

20 A sum of ₹ 300 is divided among P, Q and R in such a way that Q gets ₹ 30 more than P and R gets ₹ 60 more than Q. Then, ratio of their shares is

A
2 : 3 : 5
B
3 : 2 : 5
C
2 : 5 : 3
D
5 : 3 : 2