First let's calculate how much oil the cook uses per week. 15(2 kg) = 30 kg per 4 weeks This means the cook averages 30 kg per 4 weeks → [tex] \frac{30 kg}{4 weeks} = \frac{15kg}{2weeks} [/tex] or 7.5 kg per week
Next let's calculate how much oil the cook will need for 10 weeks. 7.5 kg/weeks × (10 weeks) = 75 kg ← the weeks units cancel out
Finally divide the amount of oil the cook needs for 10 weeks by the amount of oil in a 5 kg tin. 75 ÷ 5 = 15 ANSWER: The cook will need fifteen 5 kg tins of oil.