justin is 10 years less than half his father's age. if justin is 12 years old, how old is his father?

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02-04-2015
Mathematics

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justin is 10 years less than half his father's age. if justin is 12 years old, how old is his father?

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iGreen iGreen · Answer 1 · 2015-04-02T01:32:58+02:00

iGreen iGreen

02-04-2015

Make an equation:

J = 1/2F - 10

Where 'J' represents Justin's age and 'F' represents his Father's age.

Plug in 12 for J:

12 = 1/2F - 10

Add 10 to both sides:

22 = 1/2F

Divide 1/2 to both sides or multiply by its reciprocal, 2:

F = 44

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Аноним Аноним · Answer 2 · 2015-04-02T02:05:15+02:00

Аноним Аноним

02-04-2015

22 because 12 plus 10 is 22, or because 10-12=2 2+20=22 20+2 because 10nis half of 20

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