SOLUTION: Anna's age is twice that of David's and half that of Preeya's. The total of all their ages is 21. How old is Preeya?
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Question 936009: Anna's age is twice that of David's and half that of Preeya's. The total of all their ages is 21. How old is Preeya?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = anna age
y = david age
z = preeya age
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x + y + z = 21
x = 2y
z = 2x
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put the system of linear equations into standard form
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x + y + z = 21
x - 2y = 0
2x - z = 0
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https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = anna age = 6
y = david age = 3
z = preeya age = 12
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