Question

There are 400 fish in a large tank. Model, then write an expression to find thenumber of fish in the tank if the number of fish increases by 23%.

Answer 1

Let x be the total number of fish in the tank.

We know that at the beggining we had 400 fish and that then the number increased by 23%, this means that the total number of fish are:

$\begin{gathered} x=400+400\cdot0.23 \\ x=400(1+0.23) \\ x=400(1.23) \end{gathered}$

Therefore the nynumber of fish at the end is:

$x=400(1.23)$