Tank R contained 4 times as many guppies as Tank S. When 10% of the guppies in Tank R and 20% of the guppies in Tank S were transferred to Tank T, Tank T had 36 guppies, which was 20% more guppies than before. How many less guppies were there in Tank S than Tank R in the end?
|
Tank R |
Tank S |
Tank T |
Before |
4 u |
1 u |
5x0.6 = 3 u |
Change |
- 0.4 u |
- 0.2 u |
+ 1x0.6 = + 0.6 u |
After |
3.6 u |
0.8 u |
6x0.6 = 3.6 u |
Number of guppies that were transferred from Tank R to Tank T
= 10% x 4 u
=
10100 x 4 u
= 0.4 u
Number of guppies that were transferred from Tank S to Tank T
= 20% x 1 u
=
20100 x 1 u
= 0.2 u
20% =
20100 =
15Some guppies from Tank R and Tank S were transferred to Tank T. The total number of guppies transferred from Tank R and Tank S into Tank T is the same.
Total number of guppies transferred from Tank R and Tank S into Tank T
= 0.4 u + 0.2 u
= 0.6 u
3.6 u = 36
1 u = 36 ÷ 3.6 = 10
Number of less guppies in Tank S than Tank R
= 3.6 u - 0.8 u
= 2.8 u
= 2.8 x 10
= 28
Answer(s): 28