SOLUTION: Puri has twice as many movies on DVD as he has on BluRay disc. Find the number of DVDs if he has a total of 126 movie recordings. 2x + xb=126 ??? I know this isn't right. What

Question 1014403: Puri has twice as many movies on DVD as he has on BluRay disc. Find the number of DVDs if he has a total of 126 movie recordings.
2x + xb=126 ??? I know this isn't right. What am I missing.

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Puri has twice as many movies on DVD as he has on BluRay disc. Find the number of DVDs if he has a total of 126 movie recordings.
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Equations:
d = 2b
d + b = 126
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Substitute for "d" and solve for "b"::
2b + b = 126
3b = 126
b = 42 (# of BluRay movies)
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d = 2b = 84 (# of DVD movies)
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Cheers,
Stan H.
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