Question

Afla numerele necunoscute
A) (a-80)x2-146=24
b) (100:b:3)x5=490
C) (c:9:3)x4=20

Answer 1

a) (a-80)×2=146+24
(a-80) ×2= 170
(a-80)= 170÷2
(a-80)= 85
a= 85 + 80
a= 165

(100÷b÷3)=490÷5
(100÷b÷3)=98
(100÷b)=98×3
(100÷b)= 294
b= 294×100
b= 29.400

c. (c÷9÷3)×4=20
(c÷9÷3)=20÷4
(c÷9÷3)=5
(c÷9)=5×3
(c÷9)=15
c=15×9
c= 135