Amanda, Ben, and Carlos share a sum of money. Their portions are in the ratio of 1:2:7, respectively. If Amanda's portion is 20, what is the total amount of money shared?
Amanda's is 1 out of 1+2 + 7 = 10 1/10th
10 x 20 = $ 200 total
Amanda's portion is 1/10 of the total, which is $20. Then the total amount is $200.