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