book Maths Puzzle Numerical Ability

True or False???

The union of the negative integers and the counting numbers is the set of integers??

Thanks Caroline

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book Other Question

We changed the water in our fish tank and needed to add some acid to bring the water to the right PH. We did not have any tool to measure PH, but our neighbor had a kit for his sw A chemist added 90 liters of alcohol solution A to 108 liters of 22 percent alcohol solution to get 37 percent solution. Express the concentration of the solution A in percentage. Put % after your answer.