B + A = 12
B - A = 4
- Which letter has a bigger value?
- What is the total value?
- Find A.
- Find B.
(a)
B - A = 4
So, B is has a bigger value than A.
(b)
B + A = 12
So, the total value is 12.
(c)
A = 1 u
B = 1 u + 4
Total
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 12
2 u = 12 - 4 = 8
1 u = 8 ÷ 2 = 4
A = 4
(d)
B
= 1 u + 4
= 4 + 4
= 8
Answer(s): (a) B; (b) 12, (c) 4; (d) 8