A machine can manufacture 1,805 nails in 10 minutes. how many nails can the machine make in 8 minutes?​

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?