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Anarel [89]
3 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]3 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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aliina [53]

x + 2 / 6 = 2/3

3(x + 2) = 2*6

3x + 6 = 12

3x = 6

x = 2 answer

8 0
3 years ago
Use substitution to show that 9+ 6(10-7x) is equivalent to 69-42x.
OverLord2011 [107]
9 + 60 -42x
9+60 = 69
= 69- 42x
5 0
3 years ago
Read 2 more answers
0 A public beach in Arkansas charges non- residents $12 per day for a fishing license and $3.50 per day for live bait. Arkansas
vfiekz [6]
Non Residents:
f(x)= money in $ paid.
x=number of days.

f(x)=x(12+3.5)=15.5 x

f(x)=15.5x

Arkansas residents
f(x)=money in $ paid.
x=number of days.

f(X)=x+174

Now, we equate functions:

15.5x=x+174    (this is the equation)
15.5x-x=174
14.5x=174
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6 0
3 years ago
a jogger runs 4 miles per hour faster downhill than uphill. if the jogger can run 5 miles downhill in the same time that it take
Serga [27]

Answer: the rate uphill is 6 mph.

The rate downhill is 10 mph

Step-by-step explanation:

Let x represent the rate at which the jogger ran uphill.

The jogger runs 4 miles per hour faster downhill than uphill. This means that speed at which the jogger ran downhill is (x + 4) mph

Time = distance/speed

if the jogger can runs 5 miles downhill, then the time taken to run downhill is

5/(x + 4)

At the same time, the jogger runs 3 miles uphill. It means that the time taken to run uphill is

3/x

Since the time is the same, it means that

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Cross multiplying, it becomes

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x = 12/2

x = 6

The rate downhill is 6 + 4 = 10 mph

8 0
3 years ago
Read 2 more answers
Y + 4/9 = 2/3 Solve the equation..
emmainna [20.7K]
Y + 4/9 = 2/3

Let's convert 2/3 into 6/9 so it will be easier to subtract.

Y + 4/9 = 6/9
Subtract 4/9 on both sides.

Y = 2/9 Hope this helps!
4 0
3 years ago
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