Question

Aflati nr necunoscute 25:5+a×2=25 ;b×4+40:5=16 ;24-c×3-15:3=10 ;d:4+35:5+4=21

Answer 1

25 : 5 + a x 2 = 25
5 + 2a = 25
2a = 25 - 5
a = 20 / 2
a = 10

b x 4 + 40 : 5 = 16
4b + 8 = 16
4b = 16 - 8
b = 8 / 4
b = 2

24 - c x 3 - 15 : 3 = 10
24 - 3c - 5 = 10
19 - 3c = 10
-3c = 10 - 19
c = -9/-3
c = 3

d : 4 + 35 : 5 + 4 = 21
d : 4 + 7 + 4 = 21
d : 4 + 11 = 21
d : 4 = 21 - 11
d : 4 = 10
d = 10 * 4
d = 40