Calvin withdrew $40 from his bank account every month for
3 years. How much money, did Calvin withdrawal after 3 years

$1,440

Step-by-step explanation:

He withdrew $40 a month for 3 years. First you multiply $40 x 12 since there are 12 months in a year to see how much he spent in a year and multiply that number by 3 since he did it for 3 years.

$40 x 12 = $480

$480 x 3 = $1,440

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24