Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 161 · 40 sums

The method (Letters one side, numbers the other): Open brackets: a(x − b) = ax − ab. Fractions: multiply both sides by the LCM of the denominators — x/3 + x/4 = 14 → 4x + 3x = 168. Move letter terms to one side and numbers to the other (change the sign when a term crosses =), then divide. Word problems: consecutive numbers are n, n + 1, n + 2 …; ages in y years are age + y.

1. 1.The sum of three consecutive whole numbers is 144. What is the smallest of them?
2. 2.Solve: 5t + 5 = t + 13. What is t?
3. 3.Solve: 6(p − 3) = 2p + 30. What is p?
4. 4.Solve: 5(n − 2) = 3n + 24. What is n?
5. 5.The sum of three consecutive whole numbers is 147. What is the smallest of them?
6. 6.Solve: 5(t − 4) = 4t + 13. What is t?
7. 7.Solve: x/2 + x/5 = 42. What is x?
8. 8.A father is 11 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
9. 9.The sum of four consecutive whole numbers is 94. What is the largest of them?
10. 10.A father is 38 years older than his son. In 7 years, the father will be three times as old as his son. How old is the son now?
11. 11.The sum of four consecutive whole numbers is 238. What is the largest of them?
12. 12.The length of a rectangle is 15 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
13. 13.Solve: 6(t − 1) = t + 14. What is t?
14. 14.Solve: t/2 + t/3 = 10. What is t?
15. 15.The length of a rectangle is 5 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
16. 16.Solve: 3x + 11 = x + 15. What is x?
17. 17.Solve: 6m + 4 = 4m + 32. What is m?
18. 18.The sum of three consecutive whole numbers is 30. What is the largest of them?
19. 19.Solve: t/3 + t/2 = 5. What is t?
20. 20.Solve: n/5 + n/4 = 27. What is n?
21. 21.Solve: 6x + 1 = 2x + 21. What is x?
22. 22.The length of a rectangle is 3 cm more than its width. Its perimeter is 70 cm. What is its width (in cm)?
23. 23.Solve: 8x + 17 = 2x + 101. What is x?
24. 24.A father is 16 years older than his son. In 5 years, the father will be three times as old as his son. How old is the son now?
25. 25.The sum of two consecutive whole numbers is 83. What is the smallest of them?
26. 26.Solve: 5(x − 5) = x + 39. What is x?
27. 27.Solve: 6n + 18 = 2n + 22. What is n?
28. 28.The length of a rectangle is 1 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
29. 29.The sum of two consecutive whole numbers is 57. What is the largest of them?
30. 30.The length of a rectangle is 9 cm more than its width. Its perimeter is 118 cm. What is its width (in cm)?
31. 31.Solve: 9y + 4 = 8y + 18. What is y?
32. 32.A father is 24 years older than his son. In 4 years, the father will be four times as old as his son. How old is the son now?
33. 33.Solve: x/4 + x/5 = 9. What is x?
34. 34.The sum of two consecutive whole numbers is 119. What is the largest of them?
35. 35.Solve: 3(n − 1) = 2n + 10. What is n?
36. 36.Solve: 7t + 3 = 3t + 19. What is t?
37. 37.A father is 6 years older than his son. In 1 year, the father will be three times as old as his son. How old is the son now?
38. 38.A father is 17 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
39. 39.A father is 51 years older than his son. In 7 years, the father will be four times as old as his son. How old is the son now?
40. 40.Solve: 7t + 4 = 6t + 18. What is t?

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