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oksano4ka [1.4K]
2 years ago
12

PLEASE PLEASE HELP THANKS SO MUCH

Mathematics
2 answers:
yawa3891 [41]2 years ago
7 0

Answer:

a=12

b=9

Step-by-step explanation:

b=0.75a

a+b=21

a+0.75a=21

1.75a=21

a=12

a+b=21

12+b=21

b=9

ruslelena [56]2 years ago
5 0

Answer:

a= 12

b= 9

I hope this helps

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3 years ago
The sum of a number, 1/6 of that number, 2 1/2 of that number, and 7 is 12 1/2. Find the number
Whitepunk [10]

Answer:

The sum of a number, 1/6 of that number, 2 1/2 of that number, and 7 is 12 1/2. Find the number?

the number is 2.409

Step-by-step explanation:

based on the question;

let the  number  N

1/6 of N = (1/6)N

21/2  of N = ( 5/2)N

now, the sum of  a number (N)  1/6 of that number(1/6)N , (5/2)N and 7  will be expressed as

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find the lcm of the equation

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Using cross multiplication we have

44N + 84 =  150

Collecting the like terms

44N = 150- 84

44N = 106

Divide both sides by 44

44N/44= 106/44

N = 2.409

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3 years ago
Please Help!
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Answer:

See attached

Step-by-step explanation:

<em>Refer to attachment</em>

  • a. Law of Syllogism
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  • c. Law of Detachment

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Step-by-step explanation:

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