Question

21. There are 80 cookies at the bakery. Each cookie is either chocolate chip or sugar cookie. There are 4 more chocolate chip cookies than 3 times the number of sugar cookies(S). How many sugar cookies are there?

Answer 1

`19\ sugar\ cookies`

Explanation:

Let

c------> the number of chocolate chip cookies

s-----> the number of sugar cookies

we know that

`s+c=80` -----> equation A

`c=3s+4` -----> equation B

substitute equation B in equation A

`s+(3s+4)=80`

solve for s

`4s+4=80`

`4s=80-4`

`s=76/4=19\ sugar\ cookies`