I believe the answer is: 30 to 40<span>
The view was made after considering several factors that might influence the intellectual performance of the test takers. Including, anxiety that they face during the exam, the mistakes that they made from being timed, the luck that have when they're just guessing the answer, etc.
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Are you serious? Is this a 'trick' question? You don't know that silica has density greater than water? Trick Question....
I'm beginning to 'wonder' about this site. I'll bet you're stood-up by an ABC-Agency.
Who would ask kids this kind of question?
Info-miner's or 'profilers'!
Answer:
he took over Czechoslovakia and Austria
Explanation: