Answer: 1/6
Step-by-step explanation:
x = the unknown number
19x = the product of 19 and the unknown number
x+3 = the unknown number increased by 3
Set those two expressions equal to one another. Isolate x.
19x = x+3
19x-x = 3
18x = 3
x = 3/18
x = 1/6
The unknown number is the fraction 1/6.