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Exam CBEST Section 1 Math topic 1 question 22 discussion

Actual exam question from Test Prep's CBEST Section 1 Math
Question #: 22
Topic #: 1
[All CBEST Section 1 Math Questions]

Jerry was 1/3 as young as his grandfather 15 years ago. If the sum of their ages is 110, how old is Jerry’s grandfather?

  • A. 80
  • B. 75
  • C. 65
  • D. 60
  • E. 50
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Suggested Answer: B 🗳️
This uses two algebraic equations to solve for the age. Jerry (J) and his grandfather (G) have a sum of ages of 110 years. Therefore, J + G = 110. Jerry was one- third as young as his grandfather 15 years ago. Therefore, J 15 = 1/3 (G 15). Solve the first equation for J: J = 110-G. Now substitute this value of J into the second equation: 110 G 15 = 1/3 (G 15). Solve for G: 95 G = 1/3 G 5; 100 = 4/3 G; G = 75.

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JoanTana
2 years ago
What does it mean when you type "J 15 = 1/3 (G 15)"? This is confusing. What is the operation between J and 15? between G and 15? My guess is minus? Sorry, but the solution is confusing without the minus sign.
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