Question 557831
Numbers greater than 0.3 and less then 0.35 are between .6 and .7 when doubled.
Lets assume it is a decimal that goes up to the thousandths. 
0.310 to 0.324 Would be closer to .6 than .7. We know the thousands digit has to be a 1 or a 6 because its double ends in a two. So it looks like our options are 
.311,.316 and.321