vieraml58
05.05.2020 •
Mathematics
The sum of three numbers is 72
The second number is 7 times the first.
The third number is 18 less than the second
What is the first number?
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Ответ:
Let the first number be x, second number be 7x and the third number be 7x-18. Then,
Sum of the numbers=72
or, x+(7x) +(7x-18)=72
or, 15x=90
or, x=6
So, the first number is 6.
Ответ: