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1–7Problem-Solving Investigation:Guess and CheckMAIN IDEA• Solve problems byusing the guess andcheck strategy.EXAMPLEHal is younger than Randi. Each of their ages is adifferent prime number. The total of their ages is 91.How old are Hal and Randi?UNDERSTAND You know thatis younger than. Each of their ages is a differentnumber, and the total of their ages is. You need to find what their ages are.PLANMake a guess until you find an answer thatmakes sense for the problem.SOLVEHalPrimeNumber?RandiPrimeNumber?Total(Hal + Randi)11 yes 80 91Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.HOMEWORKASSIGNMENTPage(s):Exercises:CHECK7 84 no 915 yes no 912 yes 89 yesSo, Hal isyears old.years old, and Randi isHal’s age is less than Randi’s age. Both 2 and89 are prime numbers, and 2 + 89 = 91. So,the answer is correct.Check Your Progress MONEY Leah has 5 bills and 3coins in her pocket. If she has a total of $27.31 in her pocket,what kinds of bills and coins does she have?Math Connects, Course 1 17