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Interesting math
1 The teacher gave two questions. Class 18 students, the first question 10 students answered correctly, the second question 12 students answered correctly, and three students didn't answer both questions correctly. How many students answered all the questions correctly?

Xiao Ming and Obana Xiaoli went for a spring outing together, and * * * brought 17 pears. Xiao Ming takes half, Xiao Hua takes one third and Xiao Li takes one ninth, but when dividing pears, you are not allowed to cut any pear with a knife and let them each take a few pears.

Three people went to a hotel ... lived in three rooms ... The room rate for each room was 65,438 yuan ... so they * * * paid the boss 30 yuan money ... The next day ... the boss thought that three rooms were enough as long as 25 yuan ... so he asked his younger brother to pay back 5 yuan money to three guests ... Who knows that my younger brother is greedy for money ... and only returned it to everyone 1 yuan ...

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