Question

Daca la 1 supra 5 dintr-un numar A adaug 3,obtin 1 supra 4 din a
va rog mult dau coronita

Answer 1

A*1/5+3=A*1/4
aducem la acelasi numitor (20)
4A+60=5A => A=60

$\frac{1}{5} *A +3 = \frac{1}{4} *A$
aducem la acelasi numitor (20)
$\frac{1*4}{5*4}*A + 3* \frac{20}{20} = \frac{1*5}{4*5}*A => 4A+60=5A =>5A-4A=60$
A=60