By increasing 91 in the ratio 7 : 13, we get :

1. 182
2. 169
3. 121
4. 116

If 12 : x : : 15 : 25, then the value of x is

1. 10
2. 15
3. 18
4. 20

The mean proportional between 5 and 45 is

1. 10
2. 12
3. 15
4. 25

Which of the following are in continued proportion?

1. 4, 8, 12
2. 5, 15, 25
3. 6, 36, 216
4. 9, 12, 18