MCQ
Tick $(\checkmark)$ the correct answer: If $\text{z}=\frac{4}{5}(\text{z}+10),$ then $\text{z} = ?$
  • $40$
  • B
    $20$
  • C
    $10$
  • D
    $60$

Answer

Correct option: A.
$40$
$\text{z}=\frac{4}{5}(\text{z}+10)$
$\Rightarrow5\text{z}=4(\text{z}+10)$
$\Rightarrow5\text{z}=4\text{z}+40$
$\Rightarrow5\text{z}-4\text{z}=40$
$\Rightarrow\text{z}=40$

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