book Maths Puzzle Numerical Ability

The amount of paint in stock is represented by the function b(x)=4/5x, where b(x) is the amount of paint and x is the number of days until it runs out. How much will be left 4 day

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book Other Question

What is the written answer to (-51)/(-17) Hello. THe problem states add or subtract and the problem itself is
9i + (-9 - i). I have come up with -9+8i as a solution. Could you please tell me if this is correct and if not, where I messed up. Thanks in advance.