Question

the ratio of frogs to fish in a pond is 4:21. there r 84 fish in the pond. how many frogs r in the pond?

Answer 1

\[\frac{4}{21}=\frac{x}{84}\iff x=\frac{84\times 4}{21}\]

Answer 2

what

Answer 3

ratio is the same as a fraction
\[\text {ratio of frogs to fish}=4:21\] is the same as saying
\[\frac{\text{# of frogs}}{\text{# of fish}}=\frac{4}{21}\]

Answer 4

you know the number of fish is 84 you don't know the number of frogs
set up the ratio as
\[\frac{4}{21}=\frac{\text{ # of frogs}}{84}\]

Answer 5

solve this for the number of frogs by computing
\[\text{# of frogs}=\frac{84\times 4}{21}\]

Answer 6

thanks