Mathematics, 03.04.2020 17:45 chelsearodi3985

2) In a certain school, the pupils have to study Mathematics, Science or Geography. Each pupil must study at least one of the three subjects. Among a group of 40 pupils, 20 are studying Mathematics, 22 Science and 28 Geography; 12 are studying Mathematics and Science, 14 are studying Science and Geography and 15 are studying Mathematics and Geography. How many pupils are studying all the three subjects?

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