EM-1652

Changing the subject of a formula

E Math · Secondary 4 · Hard · Changing the subject of a formula

1. $q = \dfrac{5pr}{4p - 20r}$
2. $q = \dfrac{5pr}{20r - 4p}$
3. $q = \dfrac{4p - 20r}{5pr}$
4. $q = \dfrac{pr}{4p - 20r}$

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