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+ 15 = 36
Thus, the total number of molecules is \(\boxed{36}\).
How many positive 3-digit numbers are divisible by 7?
We want to find the number of 3-digit numbers divisible by 7.
The smallest 3-digit number is 100, and the largest is 999.
First, find the smallest 3-digit number divisible by 7.
Divide 100 by 7:
\div 7 \approx 14.2857
The smallest integer greater than or equal to 14.2857 is 15.
So, the smallest 3-digit multiple of 7 is: