Xiao Ming has 48 stamps and Hong Hong has 40. The stamps in Xiao Qiang are 2 1 less than the sum of Xiao Ming and Hong Hong. How many are there in Xiao Qiang? 2. The school dance team has 28 people, the gymnastics team has 8 more people than the dance team, and the chorus has 9 more people than the gymnastics team. How many people are there in the choir? My mother bought 20 apples and 15 pears. I bought four fewer oranges than pears. How many more apples does my mother buy than oranges? 4. A clothing store came in and sold 12 pieces the first morning, 15 pieces in the afternoon and 18 pieces the next day. How many pieces were sold less than the first day? There are 10 big monkeys and 12 small monkeys in the zoo. There are fewer orangutans than monkeys 16. How many orangutans are there? 6. Students make paper flowers, including 20 red flowers, 5 less yellow flowers and 3 more blue flowers. How many blue flowers are there? 7. There are 23 apple trees in the orchard. There are 7 more pear trees than apple trees and 6 fewer peach trees. How many peach trees are there? 8. Master Wang planned to make 75 parts in 5 hours, but actually made 18 parts per hour. How many more parts did he actually produce per hour than planned? 9. Dad is 35 years old, Bi Mingming is 27 years old and Grandpa is 72 years old. How old is grandpa? 10, teacher Zhang bought 15 bottles of blue ink, red ink bought 3 bottles more than blue ink, and black ink bought 2 times more. How many bottles of black ink did he buy?