Question

In Yellowstone National Park there are 300 species of birds that migrate. This accounts for 2/7 of all the species of birds sighted in the park.

Write an equation to find the number of species of birds that have been sighted in Yellowstone National Park.

x = 300

300x =

300x =

x = 300

Answer 1

Explanation:

Let x = the number of all the species of birds sighted in the park

“300 species of birds that migrate. This accounts for 2/7 of all the species of birds sighted in the park”

the above sentence means “(2/7)x = 300”

now we can solve it :

(2/7)x = 300

⇔ 2x = 7×300

⇔ 2x = 2100

⇔ x = 2100/2

⇔ x = 1050

Answer 2

Total number of species of birds sighted at Yellowstone National park is 1050.

Explanation:

Let’s assume M represents number of species of birds that migrate and S represents total number of species of birds sighted at Yellowstone National park

The data provided can be written in numerical form as M is 2/7th of S

M = 2/7 *S

300 = 2/7 *S

2100 = 2 *S

1050 = S

S = 1050 total number of species of birds sighted in the Yellowstone National park