31). If a: b = b: c, then ratio \( \Large a^{4}:b^{4} \) is equal to
| A). ac : \( \Large b^{2} \) |
| B). \( \Large a^{2}:c^{2} \) |
| C). \( \Large c^{2}:a^{2} \) |
| D). \( \Large b^{2} \) : ac |
|
32). If a/7=b/9=c/11, then find a:b:c.
| A). 11:9:7 |
| B). 9:7:11 |
| C). 7:9:11 |
| D). 11:7:9 |
|
33). If A=1/4 B and B=1/2 C,then find the value of A : B : C.
| A). 8:4:1 |
| B). 4:2:1 |
| C). 1:4:8 |
| D). 1:2:4 |
|
34). If (a + b): (a-b) = 5 : 3, then find ( \( \Large a^{2}+b^{2} \)) : ( \( \Large a^{2}-b^{2} \)).
| A). 17 : 15 |
| B). 25 : 9 |
| C). 4 : 1 |
| D). 16 : 1 |
|
35). If 1/2 of A=2/5 of B=1/3 of C, then A:B:C is equal to
| A). 4:5:6 |
| B). 6:4:5 |
| C). 5:4:6 |
| D). 4:6:5 |
|
36). If x: y = 7 : 5, then what is the value of (5x - 2y) : (3x + 2y)?
| A). 5/4 |
| B). 6/5 |
| C). 25 /31 |
| D). 31/42 |
|
37). If a, b, c, d and e are in continued proportion, then a/e is equal to
| A). \( \Large a^{3}/b^{3} \) |
| B). \( \Large a^{4}/b^{4} \) |
| C). \( \Large b^{3}/a^{3} \) |
| D). \( \Large b^{4}/a^{4} \) |
|
38). If 2A = 3B = 4C, then find A:B:C.
| A). 2:3:4 |
| B). 4:3:2 |
| C). 6:4:3 |
| D). 3:4:6 |
|
39). In a certain school, the ratio of boys to girls is 7 : 5. If there are 2400 students in the school, then how many girls are there in the school?
| A). 500 |
| B). 700 |
| C). 800 |
| D). 1000 |
|
40). The quantity that must be added to each term of a : b, so as to make it c:d,is
| A). \( \Large \frac{ab-cd}{a-b} \) |
| B). \( \Large \frac{ac+bd}{c+a} \) |
| C). \( \Large \frac{ad+bc}{c+d} \) |
| D). \( \Large \frac{ad-bc}{c-d} \) |
|
