Valen 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 105 pieces and was left with 10% 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 |
+ 105 |
- 105 |
|
After |
9 u |
1 u |
10 x 1 = 10 u |
20% =
20100 =
15 Fixed : Total = 1 : 5
10% =
10100 =
110 Unfixed : Total = 1 : 10
Number of more pieces that Valen fixed
= 9 u - 2 u
= 7 u
7 u = 105
1 u = 105 ÷ 7 = 15
Number of pieces left unfixed
= 1 u
= 1 x 15
= 15
Answer: 15