I have been trawling for an answer to how many keywords a page should have but cannot find any real answers. Can anybody help?
im not so sure people will fully understand your question do you mean how many keywords you should target on each page? or keyword density on each page etc..?
You can target multiple keywords(no exact number could be defined) on your page. However, you should always keep your title within the range of 68 characters as Google won't consider additional characters that are crossed the limit of 68 characters...
Its on you. that you keep track of your keywords on single page.. can go with multiple keywords do more keyword research and look for your competitors.. What are they targeting??