Contact us
Choose a category below so we can get back to you as quickly as possible.
1/a+1/b=1/3 1/a+1/b+1/c=5/7 1/c=5/7-1/3=15/21-7/21=8/21 c=21/8
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.