exam Maths Puzzle Numerical Ability

Find the magnitude of the vector 3i - 3j.

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exam Other Question

Jane has two electronic beepers. One of them beeps every 4 seconds;
and the other beeps every 6 seconds. If they are turned on at exactly the same time,
how many times during the next hour will both beepers beep at the same time? How do you make equations to madel situation?