in a survey 135 students appeared in examination,60 of them got A+ in math,70 got A+ in science and 35 got A+ in social studies. 20 of them got A+ in math and science and 15 got A+ in math and social studies and 10 got A+ in science and social. if 5 did not get A+ grade in any of the three subject, find how many of them got A+ grade in all subjects.
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10 because 10 is common
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