MCQ
The root of the equation $\text{3x} =\frac{20}{7}-\text{x}$ is:
- A$\frac{7}{5}$
- ✓$\frac{5}{7}$
- C$-\frac{7}{5}$
- D$-\frac{5}{7}$
✓
Answer
Correct option: B.
$\frac{5}{7}$
$\text{3x = } \frac{20}{7}-\text{x}$
$\Rightarrow\text{ 3x + x = }\frac{20}{7}$
$\text{4x = } \frac{20}{7}$
$\Rightarrow\text{ x = }\frac{20}{7\times4}=\frac{5}{7}$
$\Rightarrow\text{ 3x + x = }\frac{20}{7}$
$\text{4x = } \frac{20}{7}$
$\Rightarrow\text{ x = }\frac{20}{7\times4}=\frac{5}{7}$
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