Barbara had some pencils at first. She gave 19 of her pencils to her cousin and 16 of her pencils to her neighbour. After that, her mother gave her another 6 pencils. She had 71 pencils in the end. How many pencils did Barbara have at first?
Fraction of pencils left after giving to her cousin and her neighbour
= 1 -
19 -
16 = 1 -
218 -
318 = 1 -
518 =
1318 Number of pencils left after giving to her cousin and her neighbour = 13 u
Number of pencils left after her mother gave her another 6 pencils = 13 u + 6
13 u + 6 = 71
13 u = 71 - 6
13 u = 65
1 u = 65 ÷ 13 = 5
Number of pencils that Barbara had at first
= 18 u
= 18 x 5
= 90
Answer(s): 90
