Eric had some buttons. He gave
23 of his buttons to Tim and bought 4 new buttons. After that, he gave
25 of his remaining buttons to his sister and bought another 7 new buttons. In the end, Eric had 40 buttons.
- How many buttons did Eric give to his sister?
- How many buttons did Eric have at first?
(a)
Fraction of his remaining buttons after he gave to his sister
= 1 -
25=
35 35 of his remaining buttons = 40 - 7 = 33
15 of his remaining buttons = 33 ÷ 3 = 11
25 of his remaining buttons = 2 x 11 = 22
Number of buttons that Eric gave to his sister = 22
(b)
55 of his remaining buttons = 5 x 11 = 55
Fraction of his total buttons after he gave to Tim
= 1 -
23=
13 13 of his total buttons = 55 - 4 = 51
33 of his total buttons = 3 x 51 = 153
Number of buttons that Eric had at first = 153
Answer(s): (a) 22; (b) 153