How many euros are equivalent to $30? Tell me how you founded your answer

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)