A contractor employed 30 men to do ,a piece of work in 38 days. After 25 days, he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?

1) 1

2) 1 ¼

3) 1 ¾

4) 1 ½

A book contains 680 pages and each page . contains 35 lines of 12 words each. If the book were to be printed on  pages containing 34 of 14 words each. How many pages would there in the book.

(1) 650 pages
(2) 700 pages
(3) 600 pages
(4) NONE OF THESE

If A and B are square matrices of the same order such that AB = A and
BA =B, then (A +B ) is equal to:

1. A - B
2. A + B
3. AB
4. None of these