Ian was fixing a jigsaw puzzle. On the second day, the number of pieces he fixed was 20% of the total number of pieces. After another two weeks, he fixed another 135 pieces and was left with 30% of the jigsaw puzzle unfixed. How many pieces were left unfixed?
|
Fixed |
Unfixed |
Total |
Before
|
1 x 2 = 2 u |
4 x 2 = 8 u |
5 x 2 = 10 u |
Change |
+ 135 |
- 135 |
|
After |
7 u |
3 u |
10 x 1 = 10 u |
20% =
20100 =
15 Fixed : Total = 1 : 5
30% =
30100 =
310 Unfixed : Total = 3 : 10
Number of more pieces that Ian fixed
= 7 u - 2 u
= 5 u
5 u = 135
1 u = 135 ÷ 5 = 27
Number of pieces left unfixed
= 3 u
= 3 x 27
= 81
Answer: 81