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Linear Equations in One Variable — Class 8 CBSE Mathematics MCQs with Solutions
Free Class 8 CBSE Mathematics Linear Equations in One Variable MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Solve: x − 5 = 12
A. 7
B. 15
C. 17 ✓ Correct
D. 60
Solution: x = 12 + 5 = 17.
Q2 — easy
Solve: x/4 = 6
A. 2
B. 10
C. 18
D. 24 ✓ Correct
Solution: x = 6 × 4 = 24.
Q3 — easy
Solve: 2x + 3 = 11
A. 3
B. 4 ✓ Correct
C. 5
D. 7
Solution: 2x = 8, so x = 4.
Q4 — hard
A number is doubled and 5 is added. The result is 29. Find the number.
A. 10
B. 12 ✓ Correct
C. 14
D. 17
Solution: 2x + 5 = 29 → x = 12.
Q5 — hard
The ages of A and B are in the ratio 5:7. After 6 years the ratio becomes 3:4. Find A's present age.
A. 25 years
B. 30 years ✓ Correct
C. 35 years
D. 42 years
Solution: 5x+6 : 7x+6 = 3:4 → 20x + 24 = 21x + 18 → x = 6, so A = 30.
Q6 — hard
Solve: 0.4x + 1.2 = 2.8
A. 2
B. 3
C. 4 ✓ Correct
D. 5
Solution: 0.4x = 1.6, so x = 4.
Q7 — medium
The sum of two consecutive numbers is 47. Find the smaller number.
A. 22
B. 23 ✓ Correct
C. 24
D. 25
Solution: x + (x+1) = 47 gives x = 23.
Q8 — medium
Solve: (2x + 1)/3 = 5
A. 5
B. 6
C. 7 ✓ Correct
D. 8
Solution: 2x + 1 = 15, so x = 7.
Q9 — medium
If 4x + 5 = 3x + 12, then x equals:
A. 5
B. 7 ✓ Correct
C. 9
D. 17
Solution: x = 12 − 5 = 7.