Question

Sabendo que A+B=13 e Y-X=1, na série de razões A/18=B/1,5=X/4, calcule Y.

Answer 1

Para resolver Y, vamos igualar e substituir valores:

$\frac{A}{B}=\frac{36}{3} = 12\\  A = 12B\\A+B=13\\A=12, B=1$

$\frac{A}{18} = \frac{X}{4}\\18X = 4A\\9X=2A\\9X=24\\X=\frac{24}{9} = \frac{8}{3}$

$Y-X=1\\Y-\frac{8}{3}=1\\Y=1+\frac{8}{3} \\Y = \frac{3+8}{3} = \frac{11}{3}$

Espero ter ajudado :D