one side of the equation has to equation the other so imagine the equal sign is a balance scale. first lets figure out the left hand side. 15/5 = 3 simple right? now lets figure out the right hand side since we know that they have to equal each other lets divide 20 by 3 20/3 = 6.666666667 so n equals 6.666666667 or rounded up 6.7:)
