Expressions using Letter Numbers Class 7 MCQ

Expressions using Letter Numbers Class 7 MCQ

Expressions using Letter Numbers Class 7 MCQ

Question 1.

Perimeter of a regular hexagon of side lengths x units is

(a) (x + 6) units

(b) x × 6 units

(c) (x ÷ 6) units

(d) (x - 6) units

Solution:

(b) x × 6 units

Question 2.

Subtracting 7 times x from y is

(a) 7x - y

(b) x - 7y

(c) 7y - x

(d) y - 7x

Solution:

(d) y - 7x

Question 3.

If p = -3, then the value of 5p - 10 is

(a) -25

(b) 25

(c) 5

(d) -5

Solution:

(a) -25

Question 4.

5 (x + y) - 5 (x - y) is equal to

(a) 0

(b) 10x

(c) 10y

(d) 10x - 10y

Solution:

(c) 10y

Question 5.

x + y + y + y + x - x - y is equal to

(a) x + 2y

(b) x - 2y

(c) x + y

(d) x - y

Solution:

(a) x + 2y

Case Study

Question 1.

Age in Years

Five years ago, Ahmad was x years old. His sister is 3 years younger than him and his brother is y years older than him

Fill in the blanks :

(a) Present age of Ahmad is _______ years.

(b) Present age of his brother is ______ years.

(c) Age of his brother 7 years ago was _______ years.

(d) Difference of the ages of Ahmad’s brother and sister is _______ years.

(e) Sum of the present ages of all the three is

(i) (3x + y + 12) years

(ii) (3x + y - 12) years

(iii) (3x + y + 7) years

(iv) (3x + y - 7) years

Solution:

(a) x + 5;

(b) x + y + 5;

(c) x + y - 2;

(d) y + 3;

(e) (i).

Question 2.

Weight of Friends

Total weight of three friends A, B and C is 15z kg. Weight of A is [latex]\frac {1}{3}[/latex] of the total weight +1 kg and that of B is 2 kg more than A.

Fill in the blanks :

(a) Weight of A is _______ kg.

Solution:

5z + 1

(b) Weight of B is _______ kg.

Solution:

5z + 3

(c) Weight of B is [latex]\frac {1}{3}[/latex] of total weight + ________ kg.

Solution:

3

(d) Weight, of C (in kg) is

(i) 5z + 3

(ii) 5z - 3

(iii) 5z - 4

(iv) 5z + 4

Solution:

(iii) 5z - 4

(e) Difference of weights of A and C is 4 kg. (True or False)

Solution:

False.