Question

to prepare for a math test Eric study three times as long as Kendra and 1/2 as long as Geraldo. How long did Geraldo study if Kendra studied for 20 minutes?

Answer 1

Let

x---------> time in minutes used by Eric to study

y---------> time in minutes used by Kendra to study

z---------> time in minutes used by Geraldo to study

we know that

x=3y------> equation 1

x=0.5z

z=2x--------> equation 2

y=20 minutes --------> equation 3

substitute equation 3 in equation 1

x=3*20=60 minutes

find the value of z in equation 2

z=2*60=120 minutes

therefore

the answer is

The time in minutes used by Geraldo to study was 120 minutes