Question 253827
Well the opposite means negative number if the number is positive.

For example if the number was 10, the opposite of that would be -10. The difference between these two numbers is 20.

So we are a look for a number which is half of 150, which is 75.

Using Algebra: {{{150= a-(-a)}}}, Remember that minus a minus is a postivie so {{{150=a+a}}}, {{{150=2a}}}, {{{150/2=a}}}

Make any sense?