Tank D contained 4 times as many guppies as Tank E. When 20% of the guppies in Tank D and 20% of the guppies in Tank E were transferred to Tank F, Tank F had 60 guppies, which was 20% more guppies than before. How many less guppies were there in Tank E than Tank D in the end?
|
Tank D |
Tank E |
Tank F |
Before |
4 u |
1 u |
5x1 = 5 u |
Change |
- 0.8 u |
- 0.2 u |
+ 1x1 = + 1 u |
After |
3.2 u |
0.8 u |
6x1 = 6 u |
Number of guppies that were transferred from Tank D to Tank F
= 20% x 4 u
=
20100 x 4 u
= 0.8 u
Number of guppies that were transferred from Tank E to Tank F
= 20% x 1 u
=
20100 x 1 u
= 0.2 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
= 0.8 u + 0.2 u
= 1 u
6 u = 60
1 u = 60 ÷ 6 = 10
Number of less guppies in Tank E than Tank D
= 3.2 u - 0.8 u
= 2.4 u
= 2.4 x 10
= 24
Answer(s): 24