Six out of the 12 members of the school choir boys. In the simplest form, what fraction of the choir is boys? Pls help out with this question

Which expression is equivalent to -5(3x - 6/7)

With alll of except for the 2 that i did already

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)