turtle:4,8,x,16,20

Question

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.