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Anarel [89]
2 years ago
12

Concrete consists of six parts gravel to one part cement. A builder makes up 140kg of concrete mixture. What is the weight of gr

avel used in this mixture?
Mathematics
1 answer:
solniwko [45]2 years ago
4 0

Answer:

120kg

Step-by-step explanation:

The ratio of gravel to cement is 6:1

Then add them up which is 7

The do 140 divided by 7 which is 20

Then do 6 times 20 which is 120

Then do 1 times 20 which is (obviously)20

Then add 20 and 120 which makes 140

Hope it helps!

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2 years ago
A piece of wire 52cm long is cut into two parts , each of the wire is bent to form a square.If the sum of the area of the two sq
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Side lengths of the squares are x and y

4x+4y=52
divide both sides by 4 for simlicity
x+y=13


area is 89 so
x²+y²=89

ok

so

x+y=13
minus x both sides
y=13-x
sub that for y in other equation

x²+y²=89
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factor
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set to zero
x-8=0
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x-5=0
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find y

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5 0
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