Andy was fixing a jigsaw puzzle. On the second day, the number of pieces he fixed was 40% of the total number of pieces. After another two weeks, he fixed another 120 pieces and was left with 10% of the jigsaw puzzle unfixed. How many pieces were left unfixed?
|
Fixed |
Unfixed |
Total |
Before
|
2 x 2 = 4 u |
3 x 2 = 6 u |
5 x 2 = 10 u |
Change |
+ 120 |
- 120 |
|
After |
9 u |
1 u |
10 x 1 = 10 u |
40% =
40100 =
25 Fixed : Total = 2 : 5
10% =
10100 =
110 Unfixed : Total = 1 : 10
Number of more pieces that Andy fixed
= 9 u - 4 u
= 5 u
5 u = 120
1 u = 120 ÷ 5 = 24
Number of pieces left unfixed
= 1 u
= 1 x 24
= 24
Answer: 24