Question

turtle:4,8,x,16,20
Sea Lions: 7,14,21,28,35
There are 4 turtles for every 7 sea lions at a zoo. How many turtles are there if there are 21 sea lions?

Answer 1

To find out how many turtles there are if there are 21 sea lions, we can use the ratio given: there are 4 turtles for every 7 sea lions.

Given that there are 21 sea lions, we can set up a proportion based on the ratio:

\[
\frac{\text{Turtles}}{\text{Sea Lions}} = \frac{4}{7}
\]

Let \( T \) represent the number of turtles. Using the proportion, we have:

\[
\frac{T}{21} = \frac{4}{7}
\]

Now, we can cross-multiply:

\[
7T = 4 \times 21
\]

Calculating the right side:

\[
7T = 84
\]

Now, divide both sides by 7 to solve for \( T \):

\[
T = \frac{84}{7} = 12
\]

Therefore, if there are 21 sea lions, there are **12 turtles**.