Question

dau coroana @
a supra b=7 supra 2 si b=4 supra 21
a=?

Answer 1

$\frac{a}{b} = \frac{7}{2}$

$2a = 7b$

$2a = 7 \times \frac{4}{21}$

$2a = \frac{28}{21}$

$2a \times 21 = 28$

$42a = 28$

$a = \frac{28}{42}$

$a = \frac{14}{21}$