Number System
The difference between a two-digit number and the number obtained by interchanging its two digits is 45. The sum of the digit of the number is 9. What is the product of the two digits of the number?

12
15
13
14

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Number System
There are seven boys and four girls in a row. In how many ways can they be seated in the row so that all the girls do not sit together ?

11! - 8! x 3!
10! - 7! x 3!
11! - 8! x 4!
11! - 7! x 4!

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Number System
The sum of 8 consecutive odd numbers is 656. Also average of four consecutive even numbers is 87. What is the sum of the smallest odd number and second largest even number ?

167
158
163
160

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