exam Maths Puzzle Numerical Ability

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

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exam Other Question
Which problem solve the equation below?
15x=120
F) chang collected 120 foreign postage stamps last year.He gave 15%of them to friends.what is x,the number of stamps Ch multiply and simplify:

x^5y^3/x^2+13x+30 multiplication sign x^2+2x-3/x^7y^2

Thanks soooo much !