Tick (✓) the correct answer
If $z=\frac{4}{5}(z+10)$, then $z=?$
(a) 40
(b) 20
(c) 10
(d) 60
$z=\frac{4}{5}(z+10)$
$\Rightarrow 5 z=4(z+10)$
$\Rightarrow 5 z=4 z+40$
$\Rightarrow 5 z-4 z=40$
$\Rightarrow z=40$
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