Divide top and bottom by 2= 7/1
Multiply top and bottom by 3. 21/3
Multiply top and bottom by 4 = 28/4
Well a dime is 10 cents each so 2 dimes would be 20 cents. a dollar is 100 cents. 20/100 which is also 1/5 of a dollar.
HOPE I HELPED!!!
I would say a but not 100% sure.
You must first attach the problems with your question.