Tank D contained 4 times as many guppies as Tank E. When 10% of the guppies in Tank D and 30% of the guppies in Tank E were transferred to Tank F, Tank F had 168 guppies, which was 20% more guppies than before. How many more guppies were there in Tank F than Tank E in the end?
|
Tank D |
Tank E |
Tank F |
Before |
4 u |
1 u |
5x0.7 = 3.5 u |
Change |
- 0.4 u |
- 0.3 u |
+ 1x0.7 = + 0.7 u |
After |
3.6 u |
0.7 u |
6x0.7 = 4.2 u |
Number of guppies that were transferred from Tank D to Tank F
= 10% x 4 u
=
10100 x 4 u
= 0.4 u
Number of guppies that were transferred from Tank E to Tank F
= 30% x 1 u
=
30100 x 1 u
= 0.3 u
20% =
20100 =
15Some guppies from Tank D and Tank E were transferred to Tank F. The total number of guppies transferred from Tank D and Tank E into Tank F is the same.
Total number of guppies transferred from Tank D and Tank E into Tank F
= 0.4 u + 0.3 u
= 0.7 u
4.2 u = 168
1 u = 168 ÷ 4.2 = 40
Number of more guppies in Tank F than Tank E
= 4.2 u - 0.7 u
= 3.5 u
= 3.5 x 40
= 140
Answer(s): 140