[tex] \frac{the \: ratio \: of \: the \: needed \: object} {tota \: ratio} \times total \: number[/tex] The ratio is 5:3 It is asked for oatmeal Therefore the ratio of the needed object (the oatmeal) is 3 Total ratio is 8 (5+3) Total number (of cookies) is 40 Therefore, 3/8 ×40 = 15 Therefore the number of oatmeal cookies is 15
