B + A = 8
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 = 8
So, the total value is 8.
(c)
A = 1 u
B = 1 u + 4
Total
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 8
2 u = 8 - 4 = 4
1 u = 4 ÷ 2 = 2
A = 2
(d)
B
= 1 u + 4
= 2 + 4
= 6
Answer(s): (a) B; (b) 8, (c) 2; (d) 6