Tank V contained 3 times as many guppies as Tank W. When 30% of the guppies in Tank V and 40% of the guppies in Tank W were transferred to Tank X, Tank X had 39 guppies, which was 50% more guppies than before. How many less guppies were there in Tank W than Tank V in the end?
|
Tank V |
Tank W |
Tank X |
Before |
3 u |
1 u |
2x1.3 = 2.6 u |
Change |
- 0.9 u |
- 0.4 u |
+ 1x1.3 = + 1.3 u |
After |
2.1 u |
0.6 u |
3x1.3 = 3.9 u |
Number of guppies that were transferred from Tank V to Tank X
= 30% x 3 u
=
30100 x 3 u
= 0.9 u
Number of guppies that were transferred from Tank W to Tank X
= 40% x 1 u
=
40100 x 1 u
= 0.4 u
50% =
50100 =
12Some guppies from Tank V and Tank W were transferred to Tank X. The total number of guppies transferred from Tank V and Tank W into Tank X is the same.
Total number of guppies transferred from Tank V and Tank W into Tank X
= 0.9 u + 0.4 u
= 1.3 u
3.9 u = 39
1 u = 39 ÷ 3.9 = 10
Number of less guppies in Tank W than Tank V
= 2.1 u - 0.6 u
= 1.5 u
= 1.5 x 10
= 15
Answer(s): 15