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kirza4 [7]
2 years ago
6

Terry sees this offer. 35% off refurbished phone, now only £78. What was the orginal price?

Mathematics
1 answer:
KengaRu [80]2 years ago
8 0
35% off means that now it costs 100%-35%=65% of the original price

<span>£78 ---- 65%
x------100%

x=78*100/65=120</span>£<span>

or 
part/whole=0.65
78/whole=0.65
whole =78/0.65 =120 </span>£ 
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How much water do you add  to make 12% sugar syrup using 5g sugar?
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A square based brass plate in 4mm high and has a mass of 1.05kg. The density of the brass is 4.2g/cm3, calculate the length of t
Bezzdna [24]

Answer:

Length = 25cm

Step-by-step explanation:

Given

Brass Shape: Square

Density = 4.2g/cm^3

Mass = 1.05kg

Height = 4mm

Required

Determine the length of the plate

First, we need to calculate the Volume of the Brass using

Density = \frac{Mass}{Volume}

Make Volume the subject of formula

Volume = \frac{Mass}{Density}

Substitute 1.05kg for Mass and 4.2g/cm³ for Density

Volume = \frac{1,05\ kg}{4.2\ g/cm^3}

Convert 1.05 kg to grams

Volume = \frac{1.05 * 1000\ kg}{4.2\ g/cm^3}

Volume = \frac{1050 \ kg}{4.2\ g/cm^3}

Volume = \frac{1050 \ kg}{4.2\ g/cm^3}

Volume = 250cm^3

Next is to determine the Area of the brass;

Volume = Height * Area

Substitute 250cm³ for Volume and 4mm for Height

250cm^3 = 4mm * Area

Convert mm to cm

250cm^3 = 4 * 0.1cm * Area

250cm^3 = 0.4cm * Area

Divide both sides by 0.4cm

\frac{250cm^3}{0.4cm} = \frac{0.4cm * Area}{0.4cm}

\frac{250cm^3}{0.4cm} =Area

625cm^2 = Area

Area = 625cm^2

Lastly, we'll calculate the length of the brass

Since the brass is square based;

Area = Length^2

Substitute 625cm² for Area

625cm^2 = Length^2

Take square root of both sides

\sqrt{625cm^2} = Length

25cm = Length

Length = 25cm

<em>Hence, the length of the square brass is 25cm</em>

5 0
2 years ago
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