Question

What number when increased by 75% of itself will equal to 80?

Answer 1

`p\%=(p)/(100)\to 75\%=(75)/(100)=0.75\\\\n-the\ number\\\\the\ equation:\\\\n+0.75n=80\\\\1.75n=80\ \ \ \ |:1.75\\\\n=(80\cdot100)/(1.75\cdot100)\\\\n=(8000)/(175)\\\\n=(8000:25)/(175:25)\\\\n=(320)/(7)\\\\n=45(5)/(7)`