Earthquakes are measured using the Richter scale which calculates the amount of energy (in ergs) the earthquake releases.

An earthquake measuring 4 on the Richter scale releases ergs of energy.

An earthquake measuring 8 on the Richter scale releases ergs of energy.

An earthquake measuring 8 on the Richter scale releases how many times as much energy as an earthquake measuring 4?

A solar panel grid on a school roof produces an average of 8.6 kWh of energy per day.

How much energy will the grid produce for the school on average over 7 days?

A laundromat can wash 12 loads of laundry in one hour at full capacity.

A standard load of laundry weighs 7 kilograms.

Here is some information about two different washing machines.
 

Working at full capacity, how many litres of water would the laundromat expect to save in one hour by using the front loader instead of the top loader?

Genghis and Kublai are shooting arrows at a target.

Genghis shoots an arrow every 3 seconds.

Kublai shoots an arrow every 8 seconds.

They shoot their first arrow together at 10:00 am.

How many more times will they shoot arrows at exactly the same time in the next 3 minutes?

Brendan lives in New York and returns to visit his hometown, Perth, every three years.

His next visit in 2020 will also let him attend the Mining Expo that is held once every two years.

When was the last year that Brendan visited Perth at the same time as the Mining Expo was held?

It takes Cadel 1.6 minutes to ride his bike one full lap around a lake track.
 

 
How many laps does Cadel complete in 8 minutes?

A motorbike used 72 litres of fuel to complete a 480 km rally.
 

 
On average, how many litres of fuel did the motorbike use every 100 km?

Harry sold one schnitzel wrap every 4 minutes at a surfing competition.
 

 
At this rate, how many minutes would it take to sell $320 worth of schnitzel wraps?

A health food packet had the following information on its label.
 

 
What was the mass of the health food packet to the nearest gram?

Saul's workshop requires lighting for 30 hours per week, every week of the year.

He uses globes that need replacing after 10 000 hours of use.

After how long, to the nearest year, would Saul need to replace any individual globe?

Sarah is from Canada and makes maple syrup.

40 millilitres of Sarah's maple syrup has a mass of 60 grams.

How many litres is 360 grams of Sarah's maple syrup?

Marshall keeps a tin of lollipops on his desk at home.

His son Dallas takes 1 lollipop out every 3 days.

Marshall adds a new lollipop to the tin every 4 days.

The lollipops in Marshall's tin are decreasing by 1 lollipop every days.

What is the value of  ?

Alice has 5 guinea pigs.

They eat 200 grams of cabbage per day, in total.

How many grams of cabbage would 1 guinea pig eat in one week?

It takes 2 people 10 hours to pick 800 lettuces during harvesting.

At the same rate, how many hours should it take for 5 people to pick 1200 lettuces?

It takes 15 minutes for all of the sand to flow through a sand timer.

The sand timer contains 475 grams of sand.

Each millilitre of sand weighs 1.5 grams.
 

 
How many millilitres of sand flow through the timer per minute?

On a country property, 1 acre of land is recommended for every 4 sheep.

How many acres of land would be needed for 16 sheep?