exam Maths Puzzle Numerical Ability

Can someone help me with this problem?

I need to convert 16/7 to a mixed number.

Thanks,
Lyn

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exam Other Question

Please help us solve this equation:

4. One more than the difference between 18 and 7 times a number is -9

This is what we have tried:

7n + 18 +1 = -9
7n + 19 = -9
7n = -28
n= -4

Is this correct?
three faces of a box have a common vertex and their combined area is 20cm squared. What is the total surface area of the box?

thank you.