Sam puts 220g of raisins into each bag How many kilograms of raisins does he need for 15 bags?
It's a measurement of how many times the heart is beating each minute. The heart is basically a set of bags, and with each beat the bags clench together, squeezing the blood out and pushing it through your body. Then the bags relaxes, valves keep the recently pumped blood from returning, and new blood fills the bags, ready to be pumped again.
A common estimate is that global consumption of plastic bags is over 500 billion plastic bags annually. Yes that's 500,000,000,000 plastic bags used per year. In other words, that's almost 1 million plastic bags used per minute. As if that's not enough, some environmental groups have estimated that up to 1 trillion plastic bags are used worldwide each year. Now, depending on your definition of the word "trillion", that would be 1,000,000,000,000 plastic bags!