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Math question,?
Billy’s father is twice Billy’s age. Eleven years ago, Billy’s father was thrice Billy’s age then. How
old is Billy now?
2 Answers
- Anonymous2 years ago
Billy’s father is twice Billy’s age.
F = 2B
Eleven years ago, Billy’s father was thrice Billy’s age then.
F - 11 = 3(B - 11)
But F = 2B
Substitute
2B - 11 = 3(B - 11)
2B - 11 = 3B - 33
22 = B
Billy is 22
His father is 44
- RealProLv 72 years ago
F = 2B
F-11 = 3(B-11)
Solve the system.
Subtract 1st equation from second to eliminate F
-11 = 3(B-11) - 2B
-11 = B - 3*11
B = 22
And F = 44
Check for 11 years ago: 33 = 3*11 good