Jawapan

2015-08-30T22:42:29+08:00
A+b=10
a=10-b

a+c=20
(10-b)+c=20
c=20-10+b
c=10+b

b+c=24
b+(10+b)=24
2b=24-10
2b=14
b=7

a=10-b
a=10-7
a=3

c=10+b
c=10+7
c=17

a+b+c=x
x=3+7+17
x=27