book Maths Puzzle Numerical Ability

Solve each if domain is( 1,2,3,4,5,6,7,8,9):
(6-v)(1+v)v=0
y(8-y)=0

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The current in a river is 5km per hour downstream. A motorboat can go downstream a distance X miles in one third the time it takes to come back up the same distance. what is the sp suppose a middle school survey is given to find out if eighth graders should graduate a week before other students get out of school. The survey is given only to sixth graders.