Question

1) a + b+c=100 a=1 c=95 b=? 2) 411-100-c=211 c=?

Answer 1

1) a+b+c = 100
1+b+95=100
b=100-96
b=4
2) 411-100-c=211
311-c=211
c=311--211
c=100

Answer 2

1) a + b + c = 100 
a = 1 
c = 95
b = ?
1 + b + 95 = 100
96 + b = 100
b = 100 - 96
b = 4 
Proba: 1 + 4 + 95 = 100

2) 411 - 100 - c = 211
c = ?
411 - 100 - c = 211
311 - c = 211
311 - 211 = c
c = 100
Proba: 411 - 100 - 100 = 211