Class 7 A has 20 students and a reported average Math score of 8. Two students’ scores were wrongly recorded as 7, but each should be 9. Find the correct average.
Jackson pays 10,000 VND for two types of stamps and receives a candy worth 200 VND as change. Type A stamps cost 1,300 VND each and type B cost 700 VND each. How many stamps did he buy?
Halfway to school, Henry sees that continuing at the same speed would make him 5 minutes late. He doubles his speed for the remaining half and arrives 7 minutes early. How many minutes did his actual journey take?
The table lists all languages spoken by Alice, Barney, Cindy, David and Ellen.
They belong to Teams A,B,C. Each team has 3 members and collectively speaks exactly 4 languages. No team contains both Cindy and Alice. Alice is not in Team B. Only Cindy is in exactly one team. List all members of Team B.
Clarification: team memberships may overlap, as the original conditions require; “distributed” does not mean a disjoint partition.