exam Maths Puzzle Numerical Ability

If there are 6 x109 people on the Earth and there is enough freshwater to provide each person with 8.79 x 105 L, how much freshwater is on the Earth?

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5. (3 pts) Write the converse, inverse, and contrapositive of the following conditional statement
If a dog is barking, then it will not bite
x^2-7x+10=0