Answer:
A few numbers which Hal can think:
9832, 1039, 4832, 7937
Step-by-step explanation:
Consider the provided information.
According to place value.
Thousands hundreds Tens Ones
1000 100 10 1
He does remember that number had four digits and a 3 in the tens place.
For this we can write any number having 4 digit. But the number of tens place should be 3.
The few numbers which Hal can think:
9832, 1039, 4832, 7937 etc
All the above number had 4 digit and a 3 in tens place.