Erika has 6 pens fewer than Tiffany but 40 pens more than Ethan. The three children have 128 pens altogether.
- How many pens does Ethan have?
- How many pens does Tiffany have?
(a)
Number of pens Tiffany has = 1 u
Number of pens Erika has = 1 u - 6
Number of pens Ethan has = 1 u - 6 - 40 = 1 u - 46
Total number of pens
= 1 u + 1 u - 6 + 1 u - 46
= 3 u - 52
3 u - 52 = 128
3 u = 128 + 52
3 u = 180
1 u = 180 ÷ 3 = 60
Number of pens that Ethan has
= 1 u - 46
= 60 - 46
= 14
(b)
Number of pens that Tiffany has
= 1 u
= 60
Answer(s): (a) 14; (b) 60
