Risa, Irene and Penelope had a total of 601 marbles. Risa gave
47 of her marbles away. Penelope gave away 5 times as many marbles as Risa and Irene gave away 77 marbles. In the end, they had 140 marbles left. How many marbles did Irene and Penelope have in total in the end?
| |
Risa |
Irene |
Penelope |
Total |
| Before |
7 u |
? |
? |
601 |
| Change |
- 4 u |
- 77 |
- 20 u |
- 461 |
| After |
3 u |
? |
140 |
Number of marbles that Penelope gave away
= 5 x 4 u
= 20 u
Number of marbles given away
= 4 u + 77 + 20 u
= 24 u + 77
24 u + 77 = 601 - 140
24 u = 461 - 77
24 u = 384
1 u = 384 ÷ 24 = 16
Number of marbles that Irene and Penelope had in the end
= 140 - 3 u
= 140 - 3 x 16
= 140 - 48
= 92
Answer(s): 92
