Jo's mother, Anne, is four times as old as Jo. In four years time, Anne will be three times as old as Jo. How old is Jo? (this i
s an easier version of a riddle we'll do in AP CS)
2 answers:
Answer:
Jo's age = x = 8 years
Step-by-step explanation:
Let
Jo's age = x
Jo's mother, Anne's age = 4x
In four years time, Anne will be three times as old as Jo.
Jo's age =3( x + 4)
Jo's mother, Anne's age = 4x + 4
How old is Jo?
Equate Jo's age and his mother's age
3(x + 4) = 4x + 4
3x + 12 = 4x + 4
3x - 4x = 4 - 12
-x = - 8
Divide both sides by -1
x = 8
Therefore,
Jo's age = x = 8 years
Answer:
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Step-by-step explanation:
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5) 2(4 - n) = -3n
2 × 4 - 2 × n = -3n
8 - 2n = -3n
-2n + 3n = -8
1n = -8
n = -8/1
n = -8
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5 - 6 - 6w = -7
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-6w = -7 + 1
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w = -6/-6
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7) 5(2r + 3) - 5 = 0
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10r + 15 - 5 = 0
10r + 10 = 0
10r = -10
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8) 3 - 5(2d - 3) = 4
3 - 5 × 2d - 5 × -3 = 4
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-10d + 18 = 4
-10d = 4 - 18
-10d = -14
d = -14/-10
d = 7/5
hope this helps you!!
You could do y÷2-x to get x - half of y
