Tick (✓) the correct answer

Question:

Tick (✓) the correct answer

If $z=\frac{4}{5}(z+10)$, then $z=?$

(a) 40

(b) 20

(c) 10

(d) 60

Solution:

(a) 40

$z=\frac{4}{5}(z+10)$

$\Rightarrow 5 z=4(z+10)$

$\Rightarrow 5 z=4 z+40$

$\Rightarrow 5 z-4 z=40$

$\Rightarrow z=40$

 

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