In worksheet on changing the subject in an equation or formula we will practice how to find the value of the variables by changing the subject in an equation or formula using the substitution method.

Worksheet on Changing the Subject in an Equation or Formula

1. Given **A = 1/2 × b × h**, when **A** = 75 and **h** = 10, find **b**.

2. Given **V = 1/3 πr²h** when **V** = 308 and **h** = 6, find **r**.

3. Given **S = 6a²** when **S** = 600, find **a**.

4. Given **P = 2 (l + b)** when **l** = 15 and **P** = 50, find **b**.

5. Given **C.P. = (S.P. × 100)/(100 × g %)** find **S.P.** when **C.P.** = $ 140 and **G%** = 5%.

6. **A = P + I** find **l** if **A** = 4500 and **P** = 3750.

7. In **C = 5/9 (F - 32) ** find **F** if **C** = 25.

8. In **V = l × b × h** find **l** if **V** = 3000, **b** = 15, **h** = 10.

9. If **D = 2r** find **r** if **D** = 50.

10. If **x + y + z = 180** find **y** if **x** = 70 and **z** = 65.

11. In **v = u + ft** find **f** if **v** = 36, **u** = l2 and **t** = 8.

12.In **gt²/4π² = l**, find the value of **t** if **l** = 49, **t** = 4.

13. In **A = 2h (l + b)**, find **h** if **A** = 50, **l** = 6, **b** = 4.

14. In **S = n/2 {2a + (n - 1) d}**, find **d** when **S** = 125, **n** = 10, **a** = 2.

15. If **C = 2 πr**, find **r** if **C** = 88, **π** = 22/7.

16. If **D = S × T**, find **S** when **D** = 450 and **T** = 15.

17. In **a = (p - m)/(p + m)**, if **a** = 3/7 and **p** = 10, find **m**.

18. If **I** = (P × R × T)/100, find **T** if **I** = 80, **P** = 400, **R** = 10.

19. In **L% = (L/C.P.) × 100**, find **L** if **L%** = 12 and **CP** = 200.

20. In **V = π r²h**, if **V** = 1540, **h** = 10, find **r**.

Answers for worksheet on changing the subject in an equation or formula are given below to check the exact answers of the above questions on finding the value of the subject in an equation or formula.

● **Formula**

**Formula and Framing the Formula**

**Change the Subject of a Formula**

**Changing the Subject in an Equation or Formula**

**Practice Test on Framing the Formula**

● **Formula - Worksheets**

**Worksheet on Framing the Formula**

**Worksheet on Changing the Subject of a Formula**

**Worksheet on Changing the Subject in an Equation or Formula**

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