Tank B contained 4 times as many guppies as Tank C. When 10% of the guppies in Tank B and 30% of the guppies in Tank C were transferred to Tank D, Tank D had 21 guppies, which was 50% more guppies than before. How many less guppies were there in Tank C than Tank B in the end?
|
Tank B |
Tank C |
Tank D |
Before |
4 u |
1 u |
2x0.7 = 1.4 u |
Change |
- 0.4 u |
- 0.3 u |
+ 1x0.7 = + 0.7 u |
After |
3.6 u |
0.7 u |
3x0.7 = 2.1 u |
Number of guppies that were transferred from Tank B to Tank D
= 10% x 4 u
=
10100 x 4 u
= 0.4 u
Number of guppies that were transferred from Tank C to Tank D
= 30% x 1 u
=
30100 x 1 u
= 0.3 u
50% =
50100 =
12Some guppies from Tank B and Tank C were transferred to Tank D. The total number of guppies transferred from Tank B and Tank C into Tank D is the same.
Total number of guppies transferred from Tank B and Tank C into Tank D
= 0.4 u + 0.3 u
= 0.7 u
2.1 u = 21
1 u = 21 ÷ 2.1 = 10
Number of less guppies in Tank C than Tank B
= 3.6 u - 0.7 u
= 2.9 u
= 2.9 x 10
= 29
Answer(s): 29