Jade had some marbles at first. She gave 210 of her marbles to her sister and 14 of her marbles to her friend. After that, her mother gave her another 13 marbles. She had 112 marbles in the end. How many marbles did Jade have at first?
Fraction of marbles left after giving to her sister and her friend
= 1 -
210 -
14 = 1 -
420 -
520 = 1 -
920 =
1120 Number of marbles left after giving to her sister and her friend = 11 u
Number of marbles left after her mother gave her another 13 marbles = 11 u + 13
11 u + 13 = 112
11 u = 112 - 13
11 u = 99
1 u = 99 ÷ 11 = 9
Number of marbles that Jade had at first
= 20 u
= 20 x 9
= 180
Answer(s): 180
