Risa has 6 pens fewer than Penelope but 13 pens more than Charlie. The three children have 179 pens altogether.
- How many pens does Charlie have?
- How many pens does Penelope have?
(a)
Number of pens Penelope has = 1 u
Number of pens Risa has = 1 u - 6
Number of pens Charlie has = 1 u - 6 - 13 = 1 u - 19
Total number of pens
= 1 u + 1 u - 6 + 1 u - 19
= 3 u - 25
3 u - 25 = 179
3 u = 179 + 25
3 u = 204
1 u = 204 ÷ 3 = 68
Number of pens that Charlie has
= 1 u - 19
= 68 - 19
= 49
(b)
Number of pens that Penelope has
= 1 u
= 68
Answer(s): (a) 49; (b) 68
