1.
In how many years will a certain sum becomes seven times of itself at 15% per year simple interest ?
2.
If x and y are the smallest and the greatest four digit numbers formed by using 1, 5, 0 and 9, then find y – x.
3.
ab = ba but b ≠ a, then find a + b.
4.
What is the multiplicative identity element in the set of integers?
5.
Find the H.C.F. of 63 and 109.
6.
If the product of two integers is 72 and one of them is − 9, then find the other integer.
7.
If x : y =2 : 3 and z : y =4 : 6, then find x : z
8.
40% of 175 + 175% of 60 =
9.
A 240 m long train running at 72 km/h crosses another train coming from opposite direction at a speed of 90 km/h in 12 seconds. Find the length of the other train.
10.
If p + q =15 and pq=54, then p – q can be
11.
Twelve men, working at 8 hours a day, can do ½ of a piece of work in 9 days. In how many days can 24 men working at 6 hours a day can do ¾ of the same work ?
12.
ab x ba,= 72 and a or b ≠ 1. Find the possible positive values of a + b.
13.
If x% of 2.4 is 18/25, then find x.
14.
Given that a + b + c = 0, find: √( xa . xb . xc )
16.
What is the remainder when (2x² + 3x +7) is divided by (x + 2)?
17.
Find the H.C.F of (18p²qr³), (24pq²r) and (27 p³qr²).
18.
Which of the following yields maximum interest for 300 months?
19.
A train covers the distance between two cities in 12 hours. How much time will a car take which has an average speed of 1.2 times that of the train .
20.
Number of terms in the expansion (a + b) (c + d) is ——–
