Roshel had some pens at first. She gave 19 of her pens to her sister and 13 of her pens to her buddy. After that, her mother gave her another 8 pens. She had 28 pens in the end. How many pens did Roshel have at first?
Fraction of pens left after giving to her sister and her buddy
= 1 -
19 -
13 = 1 -
19 -
39 = 1 -
49 =
59 Number of pens left after giving to her sister and her buddy = 5 u
Number of pens left after her mother gave her another 8 pens = 5 u + 8
5 u + 8 = 28
5 u = 28 - 8
5 u = 20
1 u = 20 ÷ 5 = 4
Number of pens that Roshel had at first
= 9 u
= 9 x 4
= 36
Answer(s): 36
