W=11

55 x 11 = 605

is world

Sony makes a dual deck dvd/vcr combo but not a dual deck vcr. Other popular brands makes a dual deck vcr system.

you can use the Coby CA-747 Dual Position CD/MD/MP3 Cassette Adapter to play your CD's thru your tape deck

We can set up this problem as a system of linear equations. Let's represent x as the number of CD's Michael has and y as the number of CD's John has.

From the problem, this yields 2 equations:

y = 15 + x (John has 15 more CD's than Michael) and

x + y = 55 (Together they have a total of 55 CD's)

we can rewrite the first equations as x - y = -15 and from here we can use eliminations to reduce the system to one variable

(x - y = -15) + (x + y = 55) = (2x = 40)

40/2 = 20, so Michael has 20 CD's

The first six positive integer multiples of 55 are:

1 x 55 = 55

2 x 55 = 110

3 x 55 = 165

4 x 55 = 220

5 x 55 = 275

6 x 55 = 330