Indices worded problem

Question

It was estimated that there were 4×10 10 locusts in the largest swarm ever seen. If each locust can consume 2 grams of grain in a day, how long would it take the swarm to consume 1 tonne of grain?.

Answer 1

4 x 10¹⁰ = number of locusts

8 x 10¹⁰ = grams eaten in a day.

 

1 tonne = 1000 kilograms

1 tonne = 1 x 10⁶ grams

 

1 x 10⁶  / 8 x 10¹⁰

0.125 x 10^-4

0.0000125