The sum of the digits of a two digit number is 9 and the product of the digits is 20. If the unit digit is greater than the tens digit. The number is

1. 45

2. 54

3. none of these

A two digit number is 5 times the sum of its digits. The number is:

1. 63

2. 36

3. 45

4. 54

Three positive numbers are in ratio 4 : 3 : 2. If the difference between square of the largest and the smallest number is 48, the numbers are;

1. 48, 36 and 24

2. 24, 18 and 12

3. 8, 6 and 2

4. 8, 6 and 4