Two supplementary angles differ by 42°. One of these angles is

1. 57°
2. 69°
3. 75°
4. 81°

The sum of the digits of a two digit number is 9. On adding 27 to the number , its digits are reversed. The number is

1. 36
2. 45
3. 54
4. 72

What number must be added to 54 so that the resulting number is 7 times the number added?

1. 6
2. 7
3. 8
4. 9

The ages of A and B are in the ratio 2 : 5. After 6 years, their ages will be in the ratio 1 : 2. The present age of B is

1. 20 years
2. 24 years
3. 30 years
4. 36 years