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Daniel [21]
3 years ago
15

I need help with 2 and 3 Please help :)

Mathematics
1 answer:
prohojiy [21]3 years ago
8 0

The answer to 2 is 60

The answer to 3 is 36

:)

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The sum of all three numbers is 12. The sum of twice the first number, 4 times the second number, and 5 times the third number i
grigory [225]

Answer:

The numbers are 7, 4 and 1

Step-by-step explanation:

Let the numbers =x, y, z.

The sum of all three numbers is 12, x+y+z=12--------i

The sum of twice the first number, 4 times the second number, and 5 times the third number is 35, 2x+4y+5z=35-------ii

The difference between 8 times the first number and the second number is 52, 8x-y=52---------iii

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substitute (iv) in (ii),

2x+4y+5(12-x-y)=35

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collect like terms

-3x-y=-25

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solving (iii) and (v) simultaneously (add iii and v), we have

11x=77

divide both sides by 11 to obtain x=7

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implies y=25-21=4

put x=7 and y=4 in (iv)

z=12-7-4=1

Hence, the numbers are 7, 4 and 1.

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3 years ago
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