Question
Find the value of 1 unit.
  1. 9 u + 100 = 640
  2. 100 + 9 u = 640
  3. 2 u - 60 = 20
  4. 20 = 2 u - 60
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

(c)

Click button first when a symbol is required. X

(d)

Click button first when a symbol is required. X

Find the value of 1 unit.
  1. 9 u + 100 = 640
  2. 100 + 9 u = 640
  3. 2 u - 60 = 20
  4. 20 = 2 u - 60