Question

media aritmetica a doua nr este 90.Aflati nr stiind ca unul este de 5 ori mai mic decat celalalt.

Answer 1

(a+b)/2=90
a=5b:
(5b+b)/2=90
6b=90*2
6b=180
b=30
daca inlocuim b in relatia a=5b, obtinem a=5*30;a=150

Answer 2

(a+b):2=90
a+b=90x2
a+b=180
a=b:5⇒b=ax5
a+5a=180
6a=180
a=180:6
a=30
b=30x5
b=150
V: (30+150):2=180:2=90