Question

a)Daca a+b=28 supra 15 si ac+bc=12 supra 25,determinati numarul c
b)Daca a-b=35 supra 108 si ac-bc=49 supra 72,determinati numarul c
DAU COROANAAAAAAA!!!!!!!!!!

Answer 1

A)a+b=$\frac{28}{15}$

ac+bc= $\frac{12}{25}$

c(a+b)= $\frac{12}{25}$

c x $\frac{28}{15}$ = $\frac{12}{25}$

c=$\frac{12}{25}$ : $\frac{28}{15}$

c= $\frac{12}{25}$ x $\frac{15}{28}$

c= $\frac{180}{700}$ =$\frac{18}{70}$  = $\frac{9}{35}$