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3 years ago

Why is the answer B?

Mathematics

1 answer:

Radda [10]3 years ago

7 0

Remark

Whatever the original price, he gets 70% in the first instance.

He gets 80% in the second instance.

He gets 90% in the third instance

His total income is 240 dollars.

Let the original price be x

Equation

70%x + 80%x +90%x = 240

70% = 0.7 ; 80% = 0.8 ;90% = 0.9

Solution

0.7x + 0.8x + 0.9x = 240 Take out x as a common factor and add the decimals.

x (0.7 + 0.8 + 0.9) = 240

2.4x = 240 Divide both sides by 2.4

x = 240/2.4

x = 100

So the watches should have brought in 3*100 = 300 dollars.

He only brought in 240 dollars.

He lost 300 - 240 = 60 dollars.

The answer is B.

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Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

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liubo4ka [24]

Explanation:

Remember: we have to isolate the variable x, so that means we have to get x by itself.

Step 1:

Let’s look at our equation:

$6x+57=2x+315$

Let’s subtract 2x from both sides of the equation, since our goal is to isolate the variable. You could also subtract 6x from both sides, but you would end up with a negative number, and I find it easier to deal with positive numbers.

$6x(-2x)+57=2x(-2x)+315\\4x+57=315$

Step 2:

Now, let’s subtract 57 from both sides of our equation.

$4x+57(-57)=315(-57)\\4x=258$

Step 3:

Since we have to isolate x, let’s divide both sides of the equation by 4.

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Our final answer: x = 64.5

None of your options is the correct answer. Notify your teacher, tutor, etc. since there none of the options are correct.

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