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Sladkaya [172]
3 years ago
7

3 7 of the total computer files were infected by a virus. A engineer later managed to restore 2 15 of the infected files. What f

raction of the total files were restored?
Mathematics
1 answer:
murzikaleks [220]3 years ago
4 0

Answer:

2/35

Step-by-step explanation:

\frac{3}{7} × \frac{2}{15}

\frac{1}{7} x \frac{2}{5}

= 2/35

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yulyashka [42]

Answer:

The dimension of the rug would be 17 ft × 9 ft.

Step-by-step explanation:

Given

length of the room = 27 ft.

width of the room = 19 ft.

suppose, she leaves a uniform strip of x ft. around the rug.

So,

The length of rug = (27-2x)ft.

Width of rug= (19-2x)ft.

∴ Area of the rug= length×width

                            =  (27-2x)(19-2x)

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                            =   513-92x+4x^2

According to the question,

513-92x+4x^2=153

513-92x+4x^2-153=0        ( subtract 153 both sides)

4x^2-92x+360=0

4(x^2-23x+90)=0

x^2-23x+90=0

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x^2-18x-5x+90=0

x(x-18)-5(x-18)=0

(x-5)(x-18)=0

x-5=0 or x-18=0             ( zero product property)

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Thus, x= 5

Hence,

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width of rug= 19-10=9 ft.

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Answer:

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