Shannon had some pens at first. She gave 19 of her pens to her brother and 23 of her pens to her friend. After that, her mother gave her another 12 pens. She had 26 pens in the end. How many pens did Shannon have at first?
Fraction of pens left after giving to her brother and her friend
= 1 -
19 -
23 = 1 -
19 -
69 = 1 -
79 =
29 Number of pens left after giving to her brother and her friend = 2 u
Number of pens left after her mother gave her another 12 pens = 2 u + 12
2 u + 12 = 26
2 u = 26 - 12
2 u = 14
1 u = 14 ÷ 2 = 7
Number of pens that Shannon had at first
= 9 u
= 9 x 7
= 63
Answer(s): 63
