book Maths Puzzle Numerical Ability

Can someone help solve this problem for me?

What is 48.3% of 1,500?
Can you show me how you get your answer?
Thanks,
Sher

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book Other Question

I need some clarification on the zero-factor theorem.

I am to solve using the zero-factor theorem the following equation:

1. g^2-3g-18=0 I tried setiing up as g^2-3=0 and -18=0 this did not make sense to me.

and 2. 16d^2=4 One number is 8 less than another number. Their sum is 80. Find the numbers.