Question

Jonathan's age is one-third Belinda's age now. In 12 years, Belinda will be m years old. a) Write an algebraic expression to represent Belinda's age now. b) Write an algebraic expression to represent Jonathan's age 5 years from now. c) If m = 36, what will Jonathan's age be 5 years from now? d) Explain how you found the answers.

Answer 1

Jonathan's age 5 years from now is 13 years

An equation is an expression used to show the relationship between two or more variables and numbers.

a) In 12 years, Belinda will be m years old.

Belinda age now = m - 12

b) Jonathan's age is one-third Belinda's age now

Jonathan age now = (1/3) * (m - 12) = (m - 12)/3

Jonathan's age 5 years from now = (m - 12)/3  + 5

c) m = 36:

Jonathan's age 5 years from now = (36 - 12)/3  + 5 = 13 years

Jonathan's age 5 years from now is 13 years

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