1.The sum of three numbers is twenty. The second number is four times the first and the sum of the first and third is eight. What are the three numbers?

Step-by-step explanation:

4x=12

x=12/4

x=3 answer

y=4*3=12 answer.

z=8-3=5 answer.

proof

3+12+5=20

20=20

3,12,5

Step-by-step explanation:

sum of three numbers = 20

sum of first and third = 8

second number = sum of three - sum of first and third = 20-8=12

second number = 4* first

first = 12/4 = 3

third = 8-3 = 5