exam Maths Puzzle Numerical Ability

i have to express to the simplest form but i am confused
2/5-y/y-2
=-3y-2
over
5(y-2)

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exam Other Question

Find the area of a triangle whose altitude is 7 feet and whose base is 22 feet a school has a hall with 1000 lockers, all of which are closed.
one thousand students start down the hall. the first student opens every locker.
the second student closes all t