Answer:
15
Step-by-step explanation:
Since we know that we already have 25 you can take away 25 from 100. now you know that you need 75 (100=25=75) then you take 75/5 and that should give you the amount of x. That would give us the amount of x because we need 5(x) and to find x we would take 75 divide it by 5 then get 15. Now we know 5(x) is also (5x15). So when you replace x with 15 the equation that equals to 100 will also come out to 100.
