Help me find this out :( I’m lost can u type out the answer btw

If a =6, what is the value of 2a(3b + 5c)?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

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?