Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 91 · 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.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?
2. 2.The length of a rectangle is 10 cm more than its width. Its perimeter is 44 cm. What is its width (in cm)?
3. 3.Solve: m/4 + m/2 = 9. What is m?
4. 4.Solve: 3m + 17 = 2m + 29. What is m?
5. 5.The length of a rectangle is 12 cm more than its width. Its perimeter is 116 cm. What is its width (in cm)?
6. 6.Solve: 6(n − 3) = n + 12. What is n?
7. 7.Solve: y/4 + y/6 = 35. What is y?
8. 8.Solve: t/2 + t/3 = 15. What is t?
9. 9.The length of a rectangle is 3 cm more than its width. Its perimeter is 118 cm. What is its width (in cm)?
10. 10.The length of a rectangle is 15 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
11. 11.A father is 14 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
12. 12.The sum of four consecutive whole numbers is 210. What is the largest of them?
13. 13.Solve: 9x + 2 = 6x + 41. What is x?
14. 14.Solve: 6(n − 2) = n + 33. What is n?
15. 15.The sum of four consecutive whole numbers is 130. What is the smallest of them?
16. 16.The sum of three consecutive whole numbers is 93. What is the smallest of them?
17. 17.A father is 16 years older than his son. In 2 years, the father will be three times as old as his son. How old is the son now?
18. 18.A father is 36 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?
19. 19.Solve: t/6 + t/5 = 11. What is t?
20. 20.Solve: y/5 + y/3 = 48. What is y?
21. 21.Solve: x/4 + x/5 = 9. What is x?
22. 22.The length of a rectangle is 14 cm more than its width. Its perimeter is 56 cm. What is its width (in cm)?
23. 23.The sum of three consecutive whole numbers is 183. What is the smallest of them?
24. 24.The sum of three consecutive whole numbers is 159. What is the smallest of them?
25. 25.Solve: 3m + 4 = 2m + 15. What is m?
26. 26.Solve: 4n + 19 = n + 28. What is n?
27. 27.A father is 27 years older than his son. In 2 years, the father will be four times as old as his son. How old is the son now?
28. 28.Solve: 6(p − 2) = 4p + 4. What is p?
29. 29.Solve: x/2 + x/3 = 35. What is x?
30. 30.Solve: 3(x − 5) = x + 15. What is x?
31. 31.Solve: 4p + 1 = 3p + 4. What is p?
32. 32.A father is 3 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
33. 33.The length of a rectangle is 7 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
34. 34.The length of a rectangle is 13 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
35. 35.A father is 18 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?
36. 36.The sum of three consecutive whole numbers is 108. What is the smallest of them?
37. 37.Solve: m/5 + m/4 = 72. What is m?
38. 38.Solve: p/6 + p/3 = 9. What is p?
39. 39.Solve: 7n + 3 = 5n + 5. What is n?
40. 40.Solve: x/4 + x/2 = 21. What is x?

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