exam Maths Puzzle Numerical Ability

Is -22 a:
Natural Number
Real Number
Interger
Rational Number
Irrational Number
Real Number

My answer: real number,whole number and an interger

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exam Other Question

The US population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United State help finding values of x and y in parallelograms PQRS
PT=x+2,TR=y,QT=2x,TS=y+3