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jekas [21]
3 years ago
5

I NEED HELP DESPERATELY

Mathematics
1 answer:
Inessa [10]3 years ago
6 0

Answer:

Yvette cleared 10 large driveways

Step-by-step explanation:

small driveway = x

big driveway = y

x+y = 25

15x + 25y = 475

y = 25-x

15x + 25(25-x) = 475

-10x + 625 = 475

10x = 150

x= 15

15 + y = 25

y =10

10 large driveways, 1 5 small driveways

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rosijanka [135]
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3 0
3 years ago
The sum of the ages of Mr Lin and his son Ethan is 38 years. In three years' time, Mr Lin will be three times as old as his son.
Sati [7]

Answer:

Mr.Lin's present age is 30 years now. His son is 8 years old now.

Step-by-step explanation:

Let L = Mr.Lin's present age,

   S = his son's present age.

First equation  is

L + S = 38.       (1)

The second equation is  

L + 3 = 3*(S+3)   (2)   ("In three years' time, Mr.Lin will be three times as old as his son.")

From (1), express S = 38-L and substitute it into (2). You  will get

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L + 3 = 114 - 3L + 9,

4L = 114 + 9 - 3,  

4L = 120,

L = 30.

8 0
3 years ago
How many degrees does the minute hand turn to get from 12:00 to 12:05
dusya [7]
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4 0
3 years ago
Read 2 more answers
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Natalka [10]

Step-by-step explanation:

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7 0
3 years ago
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Doss [256]

Answer:

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Step-by-step explanation:

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