Oliver spent last night studying for some of his upcoming tests. He spent 15 minutes studying science, 20 minutes studying math and 10 minutes studying social studies. What was the ratio of the number of minutes spent studying science to the total number of minutes he spent studying last night

The ratio is 15:45 which is also 1:3

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)