I only own blue blankets and red blankets. 8 out of every 15 blankets I have are red.

Discussion in 'Calculator Requests' started by math_celebrity, Oct 20, 2021.

Tags:
  1. math_celebrity

    math_celebrity Administrator Staff Member

    I only own blue blankets and red blankets. 8 out of every 15 blankets I have are red. If have i 45 blankets, how many are blue?

    If 8 out of 15 blankets are red, then 15 - 8 = 7 are blue
    So 7 out of every 15 blankets are blue.

    Set up a proportion of blue blankets to total blankets where b is the number of blue blankets in 45 blankets
    7/15 = b/45

    Cross multiply:
    If 2 proportions are equal, then we can do the following:
    Numerator 1 * Denominator 2 = Denominator 1 * Numerator 2
    15b = 45 * 7
    15b = 315

    To solve for b, divide each side of the equation by 15:
    15b/15 = 315/15

    Cancel the 15's on the left side and we get:
    b = 21
     

Share This Page