the sum of 3 numbers is 81 the second number is twice the first and the third number is 6times more than the second. Find the number.

Answer 1

sum=81=a+b+c
b=2a
c=6+b

81=a+2a+6+2a
81=5a+6
a=15
b=30
c=36

Answer 2

Easy to translate into Math ...

let the first be x

"the second number is twice the first "
---> 2x
"the third number is 6times more than the second"
---> 2x+6

"the sum of 3 numbers is 81"
--> x + 2x + 2x+6 = 81

solve for x , and sub into my definitions

Answer 3

15+2(15)+2(15)+6=81
15+30+30+6=81
81=81

Answer 4

I do not understand

Answer 5

The third number is six more than the second number.

Answer 6

I don't understand

Answer 7

a is15
b is 30.
c is 90.

Answer 8

What do you mean you don't understand

Answer 9

I don't understand please can you explain further