Out of 350 total fish, 20% were goldfish:
0.20 x 350 = 70 goldfish
If the number of goldfish increased enough to make them 30% of the total, then we can set up the equation:
(total number of goldfish + added goldfish) / (total number of fish + added goldfish) = 0.30
Let's use the variable "x" to represent the number of goldfish added.
(70 + x) / (350 + x) = 0.30
To solve for x, we can cross-multiply and simplify:
70 + x = 0.30(350 + x)
70 + x = 105 + 0.30x
0.70x = 35
x = 50
Therefore, 50 goldfish were added to the shop.
There were 350 goldfish and guppies in a shop. 20% of them were goldfish. After some goldfish were added, the percentage of the goldfish increased to 30%. How many goldfish were added
1 answer
1 answer