Question 720392
{{{5/B}}} = {{{8/10}}}
When you have a single fraction on either side of the equal sign, just:
Cross multiply and you have
8B = 5*10 
8B = 50
divide both sides by 8
B = 50/8
B = 6.25
:
:
YOu can prove this to yourself, on a calc 
5/6.25 = .8
8/10  = .8, equality reigns!