Question

Dau coroană.
Pls... ​Ex 3

Answer 1

$\frac{a+1}{b} =\frac{1}{4} =>b=4(a+1)=>b=4a+4$

$\frac{a}{b+1} =\frac{1}{5} =>5a=b+1$

$\left \{ {{b=4a+4} \atop {5a=b+1}} \right.$$=> 5a=4a+4+1$

$5a=4a+5=>5a-4a=5=>a=5$

$b=4a+4=>b=4*5+4=>b=20+4=>b=24$