Mary has saved $20.50 in the past 3 weeks. At this rate, how much will she save in 18 weeks?

$123

Step-by-step explanation:

$20.50/3 (weeks) = 6.83333333333

$6.83333333333 x 18 (weeks) = $123

Step-by-step explanation:

18 weeks = 6 * 3

                = 6 * 20.5

                 = $ 123

answer: the answer is one

step-by-step explanation:

pemdas, in this situation there is no parenthesis or exponents so you go to multiplication, 1x1=1, then division 1/1= 1 then addition 1+1=2 then subtraction 2-1=1