Today Puzzle #658
Puzzle No. 658 – Tuesday 21 January 2020
A swarm of what appeared to be locusts forced a passenger plane off its course in Africa last week. A large swarm can be up to 50billion locusts! They destroy crops – each eating its own body weight every day. If each locust weighs 2grams and the swarm travels 100km per day, what mass of crops will be lost if a swarm travels the 5000km from North Africa to the UK, as happened in 1954?
Today’s #PuzzleForToday has been set by Dr Shaun Fitzgerald, Fellow of Girton College Cambridge
Click here for the answer
Number of days for the journey = 5000km / 100km per day = 50 days
Mass of crops lost each day = (2/1000 kg per locust) x 50 billion locusts = 100m kg = 100,000 tonnes/day
Total mass of crops lost = 50 days x 100,000 tonnes/day = 5 million tonnes