Practice MCQ Questions and Answer on Ratio
31.
The ratio of milk to water in 80 litres of a mixture is 7 : 3. The water (in litres) to be added to it to make the ratio 2 : 1 is -
- (A) 4
- (B) 5
- (C) 6
- (D) 8
32.
The fourth proportional to 0.12, 0.21 and 8 is-
- (A) 8.9
- (B) 14
- (C) 17
- (D) 56
33.
The sides of a triangle are in the ratio of 7 : 9 : 12. The difference between the length of largest and smaller sides is 15 c.m. The length of the largest sides would be = ?
- (A) 36 cm
- (B) 12 cm
- (C) 60 cm
- (D) 24 cm
34.
A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, then the ratio of gold and copper in alloy C will be.
- (A) 5 : 7
- (B) 5 : 9
- (C) 7 : 5
- (D) 9 : 5
35.
If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to
- (A) 2 : 1
- (B) 14 : 3
- (C) 7 : 2
- (D) 1 : 2
36.
If A : B : C = 2 : 3 : 5 and A = x% of (B + C), then x is equal to -
- (A) 20
- (B) 24
- (C) 25
- (D) 28
37.
Two natural numbers are in the ratio 3 : 5 and their product is 2160. The smaller of the numbers is -
- (A) 12
- (B) 18
- (C) 24
- (D) 36
38.
A's income is Rs. 140 more than B's income ans C's income is Rs. 80 more than D's income. If the ratio of A's and C's income is 2 : 3 and the ratio of B's and D's income is 1 : 2, then the incomes of A, B, C and D are respectively = ?
- (A) Rs. 260, Rs. 120, Rs. 320, Rs. 240
- (B) Rs. 300, Rs. 160, Rs. 600, Rs. 520
- (C) Rs. 400, Rs. 260, Rs. 600, Rs. 520
- (D) Rs. 320, Rs. 180, Rs. 480, Rs. 360
39.
Two numbers are in the ratio $$1\frac{1}{2}$$ : $$2\frac{2}{3}$$ When each of these is increased by 15, they become in the ratio $$1\frac{2}{3}$$ : $$2\frac{1}{2}$$ . The greater of the numbers is = ?
- (A) 27
- (B) 36
- (C) 48
- (D) 64
40.
Divide Rs. 671 among A, B and C such that if their shares be increased by Rs. 3, Rs. 7 and Rs. 9 respectively the remainder shall be in the ratio 1 : 2 : 3.
- (A) Rs. 110, Rs. 220, Rs. 336
- (B) Rs. 112, Rs. 223, Rs. 336
- (C) Rs. 105, Rs. 223, Rs. 330
- (D) None of these