Question

află numerele necumoscute : a). (a-180)•10=200 ; 30•6-16÷2-b=19 ; (c+15)÷5=64÷8 ?

Answer 1

a) (a-180) = 200: 10 
a-180= 20
a= 180+20
a=200 
b) 180-8-b=19
172-b=19
b= 172-19
b=153
c) (c+15) : 5 = 8 
(c+15) = 8*5
c+15 = 40
c= 40 - 15 
c= 25

sper ca te am ajutat!