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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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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?

User Dan Doyon
by
8.3k points

2 Answers

6 votes

Answer:

Boron is 23

sister 13

Explanation:

User Kamil Svoboda
by
8.4k points
3 votes
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)
User Anton Manevskiy
by
8.2k points
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