The ratio of counselors to campers at a camp is 1 : 9. the ratio of campers who can swim to campers who cannot swim is 7 : 2. there are 13 counselors. how many campers can swim?

91 campers can swim

Step-by-step explanation:

step 1

Find the number of campers

we know that

The ratio of counselors to campers at a camp is 1 : 9

so

by proportion

Find the number of campers if there are 13 counselors

Let

x> the number of campers

1/9=13/x

x=9*13=117 campers

step 2

How many campers can swim?

we know that

The ratio of campers who can swim to campers who cannot swim is 7 : 2

so

The ratio of total campers  to campers who can swim is 9 : 7

by proportion

Find how many campers can swim for a total of 117 campers

Let

x> the number of campers that can swim

9/7=117/x

x=117*7/9

x=91 campers can swim

you need a common difference between consecutive terms to be constant, like 1,2,3,4 or 2,4,6,8, or 1,3,6,9

i need a picture

step-by-step explanation: