Ben had twice as many nickels as dimes. altogether, ben has $4.20. how many nickels and how many dime did ben have

Asquare parking lot has 6,400 square meters what is the length in meters

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

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.