exam Maths Puzzle Numerical Ability

i dont get this at all, please help me

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exam Other Question

How many different numbers can be formed with the digits 2,4,6,8,0 each being divisible by ten, repetition of the digits being not allowed? What question could each equation or inequality below answer? Solve if possible. Estimate if necessary.
y=1.50=1.50x+1.00