A coffee urn holds 12 litres when full. Harry fills coffee cups from the urn until the coffee runs out.
A)How many 140mls cups of coffee can be filled from the urn?
B)At the end there is not enough coffee left to fill a cup, Harry decides to drink it himself. How much coffee is there left for him?
Number of cups
= 12*1000 ml / 140 ml/cup
= 85.71 cups
So there were 85 cups and 0.71*140=100 ml for him to drink.
To find the number of 140ml cups of coffee that can be filled from the urn, you need to divide the total capacity of the urn by the capacity of each cup.
A) Calculation for number of cups filled:
Step 1: Convert the capacity of the urn to milliliters (ml). Since 1 liter equals 1000ml, the urn capacity is 12L * 1000ml/L = 12,000ml.
Step 2: Divide the urn capacity by the capacity of each cup: 12,000ml / 140ml = 85.71 cups.
However, since you cannot have fractional cups, we need to round down to the nearest whole number. Therefore, 85 cups can be filled from the urn.
B) Calculation for amount of coffee left for Harry:
Step 1: Multiply the number of cups filled by the capacity of each cup: 85 cups * 140ml/cup = 11,900ml.
Step 2: Subtract this amount from the initial capacity of the urn: 12,000ml - 11,900ml = 100ml.
Therefore, there will be 100ml of coffee left for Harry to drink.