Henry 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 30% 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 |
7 u |
3 u |
10 x 1 =
10 u |
40% =
40100 =
25 Fixed : Total = 2 : 5
30% =
30100 =
310 Unfixed : Total = 3 : 10
Number of more pieces that Henry fixed
= 7 u - 4 u
= 3 u
3 u = 120
1 u = 120 ÷ 3 = 40
Number of pieces left unfixed
= 3 u
= 3 x 40
= 120
Answer: 120
