SOLUTION: Jean is 7 years older than her brother bob and he is 3 years older than their sister Mary. If the sum of their ages is 43 how old is each? (You must set up equation and solve)
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Question 930167: Jean is 7 years older than her brother bob and he is 3 years older than their sister Mary. If the sum of their ages is 43 how old is each? (You must set up equation and solve) Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! x = jean age now
y = bob age now
z = mary age now
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x = y + 7
y = z + 3
x + y + z = 43
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put the system of linear equations into standard form
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x - y = 7
y - z = 3
x + y + z = 43
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = jean age now = 20
y = bob age now = 13
z = mary age now = 10
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