Mathematics for IGCSE & O level - Proportion (Section 3 - No. 6)
A farmer has enough feed to last his cows for 60 days. If he increases the number of cows by 50%, how long will the feed last?
30 days
40 days
50 days
90 days
Forklaring
If the number of cows increases, the feed will last for a shorter period. Cows x days = constant. If number of cows increases by 50%, new cows are 1.5*cows. new days = 60/1.5 = 40 days.