exam Maths Puzzle Numerical Ability

The average rainfall is 25 inches 15% of this is collected on a watershed as surface runoffs. If the watershed area is 20 square miles. What is the average daily supply in million

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exam Other Question
Find all solutions to the equation y(2y+7)=15
Thanks in advance This problem is giving me some trouble, will someone please help!
Which of the following describes the sequence:
5, (-5/3), (5/9), (-5/27), (5/81),...
1. Grometric, r=(-1/3)
2.