Age Problem: What is Sam's age now? [table method]

Roy is 13 years older than Sam. In 5 years, the sum of Roy's age and twice that of Sam's age is 79. What is Sam's age now?
a. 30
b. 17
c. 32
d. 22

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Solving Math Problems for:
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UPCAT LET PNPACAT PMA NCAE NAPOLCOM College Entrance Test DOST PMAEE