book Maths Puzzle Numerical Ability

Can someone give me a step by step of how to solve this?

-27.23+x=9.77

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book Other Question

Pablo is driving 40 miles per hour. After he has driven 30 miles, his brother Ricardo starts driving in the same direction. At what rate must Ricardo drive to catch up with Pablo And last one for the day...

Evaluate:

4 -1 3
5 2 -4
3 -5 2