exam Maths Puzzle Numerical Ability

bob invested $20,00, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

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exam Other Question
P is True, q and r are False- find the truth value.
a) (p ^ ~q) ^ r



b) ~(q ~ r) (a+b)^2 b^2-a^2 a-b
----- x --------- x ------
a^2-b^2 a+b (a-b)^2


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