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boron is ten years older than his sister in three years he will be twice as old as she is now. How old are they now?
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Oct 5, 2017
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boron is ten years older than his sister in three years he will be twice as old as she is now. How old are they now?
Mathematics
college
Dan Doyon
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Dan Doyon
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Answer:
Boron is 23
sister 13
Explanation:
Kamil Svoboda
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Oct 6, 2017
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Kamil Svoboda
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Equations:
B = s + 10
B+3 = 2(s+3)
-----------------------
Substitute for "B" and solve for "s"::
s+10 + 3 = 2s+6
s + 13 = 2s+6
s = 7 (Sister's age)
------
B = s + 10 = 17 (Boron's age now)
Anton Manevskiy
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Oct 10, 2017
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Anton Manevskiy
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