exam Maths Puzzle Numerical Ability

Find a number which is 150 greater than its opposite.

This just baffles me!!!!
Thanks a bunch!!
Joanne

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exam Other Question

Question 1:
There are 25 students in Mrs. Brown's class. She has a drawing for 3 prizes. how many differnet groups of three winners are there?

I said 25/3=8.33 then 8.33 squa Solve. 4 - a-4/a+5 = a^2-16/a+5

Thank you in advance.