Roshel had some pens at first. She gave 110 of her pens to her brother and 14 of her pens to her buddy. After that, her mother gave her another 18 pens. She had 109 pens in the end. How many pens did Roshel have at first?
Fraction of pens left after giving to her brother and her buddy
= 1 -
110 -
14 = 1 -
220 -
520 = 1 -
720 =
1320 Number of pens left after giving to her brother and her buddy = 13 u
Number of pens left after her mother gave her another 18 pens = 13 u + 18
13 u + 18 = 109
13 u = 109 - 18
13 u = 91
1 u = 91 ÷ 13 = 7
Number of pens that Roshel had at first
= 20 u
= 20 x 7
= 140
Answer(s): 140
