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Ghella [55]
2 years ago
6

A shop sells DVDs and CDs.

Mathematics
1 answer:
Vsevolod [243]2 years ago
3 0

Answer:

Step-by-step explanation:

Lets Price of a DVD is fixed i.e. 15

and One CD price is 5 (Not fixed)

In First situation

2 DVDs and 1 CD cost = 35 as given

2 x 15 + 5 = 35

Lets one CD price is 7.5

In Second situation

2 x 15 + 2 x 7.5 = 45

Its mean CD price may be between 5 to 7.5

In asked scenario, Martin has 50

1 DVD and 3 CDs?

1 x 15 + 3 x 7.5 = 37.5

37.5 is lesser than 50

Hence Martin has enough to buy 1 DVD and 3 CDs.

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72

Step-by-step explanation:

cross out 4 from left to right, right to left, you get 71 and 73, the mean of those two numbers is 72

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An integer is three more than another integer. Twice the larger integer is two less
Amiraneli [1.4K]

Answer:

The integers are 4 and 7 or -2 and 1.

Step-by-step explanation:

You can make a system of equations with the description of the two integers.

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The simplest and the fastest way to solve this system in this case is substitution. You can substitute x for y + 3 in the second equation.

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