I'm using double number lines. Martin bought 3 DVDs for $15.00 on Black Friday. At this price, how much would 8 DVDs cost?

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28-09-2016
Mathematics

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I'm using double number lines. Martin bought 3 DVDs for $15.00 on Black Friday. At this price, how much would 8 DVDs cost?

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A, B and C stand for 3 different numbers. The mean of A and B is 40. The mean of B and C is 35 A+B+ C Calculate ALL their values.

EAEJW EAEJW · Answer 1 · 2016-09-28T23:41:12+02:00

EAEJW EAEJW

28-09-2016

First of all, I find it easiest to write n equation.

3 / 15 x 8 =

Now that we have an equation, we can figure out a solution.

3 / 15 = 5
5 x 8 = 40

So 8 DVD's would cost $40.00.

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