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4. Ann, Ricky, and Jessica are solving a math problem. Find how
many problems Jessica solved.

Ann: If I solve 7 more problems, I will have
solved 30 problems.

Ricky: I solved 5 more problems than Ann.
Jessica: I solved 10 less problems than the

number of problems Ann and Ricky
solved together.

a. How many problems did Ann solve?

b. How many problems did Ricky solve?

c. How many problems did Ann and Ricky solve together?

d. How many problems did Jessica solve?