A survey was conductive to see how many people ride a bus to school every day. 160 people reported that they ride the bus to school every day. This number because 80% of the people surveyed. How many people were surveyed?

200 people were surveyed. You can set this up as 160/x = 80%/100%. 160 is over x as 160 is how much we know and x is the total we are trying to find. 80% is over 100% because 160 = 80% of the total and x= 100% of the total. Next you can cross multiply and get 80x= 160(100) —> 80x = 16000. Then you can solve for x by dividing both sides by 80, getting x= 200.

30 tens

90 is the greatest number of tens