EXERCISE 7A (OBJECTIVE TYPE QUESTIONS IN 1 5 SOLUTION )

 EXERCISE 7A

(OBJECTIVE TYPE QUESTIONS)

Directions: mark against the correct answer.

1.       The difference between a number and its three-fifth is 50. What is the number?

a)      75

b)      100

c)       125

d)      None of these

2.       If a number is decreased by 4 and divided by 6, the result is 8. What would be the result if 2 is subtracted from the number and then it is divided by 5?

a)      9 2/3

b)      10

c)       101/5

d)      11 1/5

e)      None of these

3.       If one – third of one-fourth of a number is 15, then three-tenth of that number is:

a)      35

b)      36

c)       45

d)      54

4.       A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number?

a)      3.5

b)      6

c)       8

d)      None of these

5.       Three – fourth of a number is 60 more than its one – third. The number is:

a)      84

b)      108

c)       144

d)      None of these

ANSWERS 

1.C

2.B

3.D

4.C

5.C

SOLUTION 

1.       Let the number be X. then, X – 3/5 X = 50  2/5X = 50        X = (50 x 5/2)

               X = 125.

2.       Let the number be x. the, x – 4 / 6 = 8      X – 4 = 48    X = 52.

                  X – 2 / 5 = 52 – 2 / 5 = 50 / 5

                   = 10.

3.       Let the number be x. the, 1/3 of ¼ of x = 15  x = 15 x 12 – 180.

                     So, required number = (3 / 10 x 180)

                   = 54.

4.       Let the number be x. the, 3 (2X + 9)=75    2x + 9 = 25    2X = 16  

            X =8.

5.       Let the number be x. then, 3/4X = 1/3 x = 60   5X /12 = 60      X = (60 x 12 / 5)

           = 144.