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Rudik [331]
3 years ago
11

A Web music store offers two versions of a popular song. The size of the standard version is 2.8 megabytes (MB). The size of the

high-quality version is 4.9 MB. Yesterday, there were 1070 downloads of the song, for a total download size of 3521 MB. How many downloads of the high-quality version were there?
Mathematics
1 answer:
MrRissso [65]3 years ago
8 0

x=  standard

y = high quality

x +y = 1070

y=1070-x

2.8x + 4.9y =3521

2.8x +4.9(1070-x) = 3521

2.8x+5243-4.9x =3521

-2.1x=-1722

x=-1722/-2.1 = 820

820*2.8 =2296

1070-820 =250

250*4.9 = 1225

1225+2296 = 3521


there were 250 high quality downloads



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Zina goes shopping. She buys in the same store two scarves and three T-shirts for
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The reduction in the price of T-shirts a week later during sales = 2 euros

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Four scarves and five T-shirts for 40 euros

Let 'x' represent the initial price of a scarf and let 'y' represent the initial price of a T-shirt, we  have;

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By multiplying equation (1) by 2 and subtracting the result from equation (3), we get;

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The price of T-shirts before the sale = 12 euros

The price of scarves before the sale = 6.5 euros.

The allowable total price for the reduced 4 scarves and 5 T-shirts is between 66 and about 82 for both initial prices to be +ve)

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