B + A = 10
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 = 10
So, the total value is 10.
(c)
A = 1 u
B = 1 u + 4
Total
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 10
2 u = 10 - 4 = 6
1 u = 6 ÷ 2 = 3
A = 3
(d)
B
= 1 u + 4
= 3 + 4
= 7
Answer(s): (a) B; (b) 10, (c) 3; (d) 7