you need to just keep solving the past year papers and be aware of the formulas and your concepts should be clear, don't worry and be calm
you will do well
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4
add all the numbers together. 10,12,15,13=40 then divide by the number of digits you added together. 40 divided by 4 is 10 the average is 10
Reduced in math means you need to subtract. 6-4
In math it means 2 4 6 8 and not math means equal
(4+4)*(4+4)=8*8=64