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Zinaida [17]
3 years ago
12

He price of a computer was decreased by 20% to £136. What was the price before the decrease?

Mathematics
2 answers:
lyudmila [28]3 years ago
8 0

The full price is represented by 100%. If this computer was decreased by 20%, so it worth 80% now.

So, we can make a rule of three: 80% value is equals to 136, how much is 100%?

80% ------------ 136

100% ----------- x

Let's multiply "making a x":

80x = 136\cdot 100\\80x = 13.600\\x = \frac{13600}{80} \\x = 170

Therefore, the price before the decrease was £170.

nata0808 [166]3 years ago
5 0

Answer:

The original price is 170

Step-by-step explanation:

Let x be the original price

x* .20 is the decrease

x - .20x = new price

.80x = new price

.8x = 136

Divide each side by .8

.8x/.8 = 136/.8

x =170

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3 years ago
Read 2 more answers
Catron evaluates the expression (negative 9) (2 and two-fifths) using the steps below.
Vlad [161]

Answer:

Catron's error is

"She did not follow order of operations"

Step-by-step explanation:

Catron evaluates the expression (negative 9) (2 and two-fifths)

That expression can be written as below

(-9)(2\frac{2}{5})

Catron's error is

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The corrected steps are

Step1: Given expression is (-9)(2\frac{2}{5})

Step2: Convert mixed fraction into improper fraction

(-9)(2\frac{2}{5})=(-9)(\frac{12}{5})

Step3: Multiplying the terms

(-9)(2\frac{2}{5})=-7\frac{-108}{5}

Therefore solution (-9)(2\frac{2}{5})=-7\frac{-108}{5}

6 0
3 years ago
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2) from 0,5 hours to 3 hours
3) from 3 to 4 hours
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That is where the is more inclined, and that happen in the last interval. There the speed is tha change in position / the time =
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