A group of 10 friends will pack bottles of water into an unknown number of coolers for a trip to the beach. Each cooler will contain 25 bottles. At the beach, the friends will share the bottles equally. Write an expression with one variable to represent the number of bottles each friend will get. Then, use your expression to find how many bottles each friend will get if they bring 2 coolers. Explain your thinking

Let x by the number of cooler

since each cooler has 25 bottles

then in total we have 25x

there are 10 friend in total to divide the bottles equally

we have 25x/10 this expresses the number of bottles each friend will get

that answers part a) of the question

now for part b)

we are told the friend brought 2 cooler

then we should have 25 (2) = 50 number of bottles in total

then it goes that each one of the friend will get 5 bottles (50/10)

Done!