book Maths Puzzle Numerical Ability

3) Evaluate. 81 � 9 - 16 � 8

i thought was 8 but i was wrong.

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book Other Question

i need help solving this equation: r(R1+R2)=R1R2,for R David has 50 candies. Today he eats 1/5 of his candies, and tomorrow he eats 1/2 of what is left. What will he have by the end of tomorrow?