book Maths Puzzle Numerical Ability

.4999 x 16.00027 is equal to?

how would i solve this problem?

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book Other Question

I am having troubles with my homework on problem solving such as 16- J= 12, what is the value of J? Our teacher taught us to make a positive 16 which crosses out the other 16 but I need help with writing this in the form a + bi.

6+-18/3
-18 squared