Matt H. answered • 11/16/14

PATIENT :-) Elem/Middle MATH and WRITING; HS SAT and COLLEGE ESSAYS!

Hi Amanda--

Your proportion wants to have "number of bracelets to number of hours" on both sides, so...

15 is to 4 as 25 is to ??, which makes your proportion look like:

15/4 = 25/n Then you cross multiply and solve for n:

15n = 100; divide by 15 so n = 100/15, which is 6.666666... for ever, or 6 and two-thirds.

Two-thirds of an hour is 40 minutes, so her total time for 25 bracelets is...

6 hours and 40 minutes.

Hope this helps!

All best,

Matt in New York