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A pack of gum costs 75 cents. That is 3 cents less than three times what the pack cost 20 years ago. Which equation could be used to find the cost of the gum 20 years ago?
A)
0.3x - 0.3 = 0.75
B)
3x - 0.3 = 0.75
C)
3x - 3 = 75
D)
3 - 3x = 75

Respuesta :

Lampa20
20 years ago it costed 3x - 3 = 75 because it costed 3 cents less than (this -3 part) 3 times of its price (price 20 years ago is x, 3 times that is 3x.
thats how we get 3x - 3 and we make it equal to 75 because we are comparing those 2 prices

So, answer is C.

Answer:

C

Step-by-step explanation:

Let the cost of a pack of gum 20 years ago = x cents

Given, present cost of a pack of gum = 75 cents

Given, present cost of a pack of gum is 3 cents less than three times what the pack costs 20 years ago.

So,

[tex]75 + 3 =3x[/tex]

[tex]75= 3x -3[/tex]

[tex]3x-3=75[/tex]

Therefore,

Equation , [tex]3x-3=75[/tex]  , can be used to find the cost of the gum 20 years ago.

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