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The ratio of students to teachers at a school is 19:1. how many students are there in each total number of people?

A. 100

B. 280

C. 440

D. 760

You spend 90 minitues practicing flip tricks and slides on your skate board. The ratio of time spent on flip tricks to time spent on slides is 7:8. How much time do you spend practicing slides?

I just need help! Thanks.

Jan 12, 2018

#1
+2

For every 20 people  19 are students and 1 is a teacher.....or   19/20 are students

A  100  x  19/20 = 95 students

B   etc    etc

8 out of 15    ( 7 + 8)    is time in slides

8/15  x  90 minutes =           time spent in slides.....

Jan 12, 2018

#1
+2

For every 20 people  19 are students and 1 is a teacher.....or   19/20 are students

A  100  x  19/20 = 95 students

B   etc    etc

8 out of 15    ( 7 + 8)    is time in slides

8/15  x  90 minutes =           time spent in slides.....

ElectricPavlov Jan 12, 2018
#2
0

So for the first would it be b?

So the second one would be 48 minutes right?

Jan 12, 2018
edited by Guest  Jan 12, 2018
#3
+2

48 min is correct for the second one

First one  :

If the ratio of  students  to teachers  is 19 : 1.......then out of 20 people...19 are students....so

19 / 20  =  95%  are students  =  .95

So......the number of students in each case  [ in red ] is

A  =  .95  * 100  =  95

B  =  .95 *  280 =  266

C  = .95 *  440  =  418

D = .95 *  760  =  722   Jan 12, 2018