Question 304541
Let one number be x and the other be y

x = 2y + 10 ... equation 1

x + y = 70 ... equation 2

put equation 1 into equation 2 

(2y + 10) + y = 70

3y = 70 - 10 

3y = 60 

y = 60/3
y = 20 

x = 2(20) + 10 = 40 + 10 = 50 

Answer: the numbers are 50 and 20