Shannon mary and john earn a weekly allowance ahannon earns the amount that is 2/3 of what john earns mary earns an amount that is 1 2/3 of what johns earns 20 dollars a week who eaens the greatest allowance and who earns the least

Shannon earns the least and Mary earns the most.

Step-by-step explanation:

We are given that,

John earns = $20 per week.

Also, Shannon earns of what John earns.

i.e. Shannon earns = = = $13.3 per week.

Plus, Mary earns of what John earns.

i.e. Mary earns = = = $33.3 per week.

Since, $33.3 > $20 > $13.3

So, we get,

Shannon earns the least and Mary earns the most.

a1=7 and an-8=an+a1

step-by-step explanation: