You are an influencer on Instagram. Company A pays you $5000 per post advertising their product. Company B pays you $2500 per post advertising their product.
You make 3 posts for Company A. How many posts do you have to make for Company B in order to earn
$25000 from advertising on Instagram?

Hi

3*5000 +X*2500 = 25 000

15 000 + 2 500X = 25 000

                2 500X = 25 000 - 15 000

                       2 500 X = 10 000

                               x = 10 000 / 2 500

                                 X = 100/25

                                   X = 4

You need 4 post for  B

3*5000 + 4* 2 500 =  15 000 + 10 000 = 25 000