105
Q:

# In a college, the ratio of the number of boys to girls is 8 : 5. If there are 160 girls, the total number of students in the college is

 A) 100 B) 250 C) 260 D) 416

Explanation:

Let the number of boys and girls be 8x and 5x.
Total number of students = 13x = 13 * 32 = 416.

Q:

The ratio of the number of boys to the number of girls in a school of 640 students, is 5 : 3. If 30 more girls are admitted in the school, then how many more boys should be admitted so that the ratio of boys to that of the girls, becomes 14 : 9.

 A) 30 B) 25 C) 15 D) 20

Explanation:

0 75
Q:

If the base radius of 2 cylinders are in the ratio 3 : 4 and their heights are in the ratio 4 : 9, then the ratio of their volumes is:

 A) 2:1 B) 1:4 C) 1:2 D) 4:1

Explanation:

0 16
Q:

If a : b = 2 : 3 and c : b = 5 : 6, then a : b : c is equal to:

 A) 10 : 15 : 18 B) 6 : 9 : 16 C) 4 : 6 : 5 D) 6 : 9 : 12

Explanation:

0 42
Q:

If a : b = 2 : 5, c: b = 3 : 4, then a : b : c is equal to:

 A) 2 : 5 : 4 B) 6 : 15 : 20 C) 2 : 5 : 3 D) 8 : 20 : 15

Explanation:

0 388
Q:

Two numbers are in the ratio 5 : 7. If the first number is 20, then the second number will be:

 A) 8 B) 22 C) 28 D) 18

Explanation:

3 398
Q:

If x is the mean proportional between 12.8 and 64.8 and y is the third proportional to 38.4 and 57.6, then 2x : y is equal to:

 A) 2 : 3 B) 4 : 5 C) 3 : 4 D) 1 : 2

Explanation:

3 323
Q:

If x is the mean proportional between 12.8 and 64.8 and y is the third proportional to 38.4 and 57.6, then 2x : y is equal to:

 A) 2 : 3 B) 4 : 5 C) 3 : 4 D) 1 : 2

Explanation:

2 472
Q:

If the radius of the circumcircle of an equilateral triangle is 8 cm, then the measure of radius of its incircle is:

 A) 16cm B) 4cm C) 12cm D) 8 cm