Question 680488
Let n = "the number"
:
 Find a number seven-fourths of which exceeds its three-fourths by 150. 
{{{7/4}}}n - {{{3/4}}}n = 150
multiply by 4, this cancels the denominators and you have:
7n - 3n = 4(150)
4n = 600
n = 600/4
n = 150
:
;
See if that checks out
{{{7/4}}}*150 - {{{3/4}}}*150 = 150
262.5 - 112.5 = 150