Question 54559
resolution:
 let the second number be x
 the other number will be 3 + x/2
average of the two numbers is (x + (3 + x/2) )/ 2= 15 1/2; 
(x + 3 + x/2)/2 = 31/2; since the equation has the same denominator cross multiple by 2 then remove 2 from both sides and solve the linear equestion that contains fraction; the linear equation will be: 2x + 6 + x = 62

solve by x: 3x = 56; x = 18.66666; 18.7
the other number will be 3 + (18.7)/2 = 12.35

add numbers (18.7 + 12.35) = 31.05; average 31.05 /2 = 15.5

the small number is 12.35