If you have a savings of $60.00 dollars in 2weeks and $120.00 dollars in 4weeks how much will this person save in 70 days?

1) in first place , calculate the rate  with  the values given

r= 120-4/60-2 = 2, , now you need to Know which is the number of weeks contained in 70 days, ok, 1 week 7 days

                                               x70 days , resolving it x =  10 weeks

2) Now as you Know the numbers of week and is 10 , you must establish a relation of proportion

$120/4 weeks

 $ X 10 weeks

X = $120*10 WEEKS / 4 WEEKS,  X =  $ 300, the quantity that a person can save to the end of tens weeks