Can someone answer asap ! will give extra points

How do i do this? i don’t understand

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?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)