It has 4 parts, but it's lot of points!

Please help I beg of you.

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost. swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Simplify the expression 10/11(22z) + (a+5) -1

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class