Barry's deck of cards has 40 blue and 70 red. Max has 40 blue cards, but the ratio of blue cards to red is 8:9. How many total cards does Max deck have?
The answer is 85 because I foun the unit rate by doing the 40 blue divided by the 8 to find that 5=1 and then multiplied 5 and 9 which equals 45 an added 45 and 40 which is equal to 85 total cards