SOLUTION: Ned has 55 marbles in his collection. He has twice as many white marbles as red marbles. He has 5 more blue marbles than white marbles. How many white marbles does Ned have?

Question 884513: Ned has 55 marbles in his collection. He has twice as many white marbles as red marbles. He has 5 more blue marbles than white marbles. How many white marbles does Ned have?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of white marbles
Let = number of red marbles
Let = number of blue marbles
--------------------------------
(1)
(2)
(3)
-----------------
(2)
Substitute (2) and (3) into (1)
(1)
(1)
(1)
(1)
and
(3)
(3)
(3)
and
(2)
(2)
(2)
Ned has 20 white marbles
check:
(3)
(3)
(3)
OK
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