When the number 210 is increased in the ratio 5 : 7, the new number is

1. 150
2. 180
3. 294
4. 420

Two numbers are in the ratio 7 : 9. If the sum of the numbers is 288, then the smaller number is

1. 126
2. 162
3. 112
4. 144

If x, 12, 8 and 32 are in proportion, then the value of x is

1. 6
2. 4
3. 3
4. 2