Ahmad was fixing a jigsaw puzzle. By the third day, the number of pieces he fixed was 30% of the number of pieces unfixed. After another 7 days, he fixed another 222 pieces and the number of unfixed pieces he was left with was 25% of the number of pieces fixed. How many pieces were left unfixed?
| |
Fixed |
Unfixed |
Total |
| Before |
3x5 =
15 u |
10x5 =
50 u |
13x5 =
65 u |
| Change |
+ 222 |
- 222 |
|
| After |
4x13 =
52 u |
1x13 =
13 u |
5x13 =
65 u |
30% =
30100 =
310 25% =
30100 =
14 Since this is a jigsaw puzzle, there is no change in the total number of jigsaw pieces. Make the total number of jigsaw pieces the same. LCM of 13 and 5 is 65.
Number of additional pieces of jigsaw puzzle that Ahmad fixed
= 52 u - 15 u
= 37 u
37 u = 222
1 u = 222 ÷ 37 = 6
Number of pieces that were left unfixed
= 13 u
= 13 x 6
= 78
Answer(s): 78
