Question

a+b=500
a=4b+64
dau coroana​

Answer 1

$4b + 64 + b = 500 \\ 5b + 64 = 500 \\ 5b = 436 \\ b = \frac{436}{5}$

$a = 4 \times \frac{436}{5} + 64 \\ a = \frac{2064}{5}$