exam Maths Puzzle Numerical Ability

6-/20 over 2

How do I do this problem?
Thanks in advance!
ac

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exam Other Question

Please help me solve this problem: -4/8 < 2/3c. I understand how to get the 2/3 on the other side but when I get to the multiplying part I get stuck. The book tells me to "find several numbers that have exactly three divisors and several others that each have exactly four divisors."