Question

(48:6+a):8=27:9
(20:a+20):6=50:10
(a:4+5):2=24:4
a:7+(36:6-21:7)=7
sunt 4 exerciti stie cineva va rog

Answer 1

(48:6+a):8=27:9
(8+a):8=3
8+a = 24
a = 16
(20:a+20):6=50:10
(20:a+20):6=5
20:a+20=30
20:a=10
a=2 
(a:4+5):2=24:4
(a:4+5):2= 6
a:4+5=12
a:4= 7
a= 28.
a:7+(36:6-21:7)=7
a:7+3=7
a:7=4
a=28

Answer 2

(8 + a) = 3 * 8
a = 24 - 8
a = 16
(20 : a + 20) = 5 * 6
20 : a = 30 - 20
10a = 20
a = 20 : 10
a = 2
a : 4 + 5 = 6 * 2
a : 4 = 12 - 5
a = 4 * 7
a = 28
a : 7 + (6 - 3) = 7
a : 7 = 7 - 3
a = 7 * 4
a = 28