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d1i1m1o1n [39]
3 years ago
10

#18 There are 8 students

Mathematics
1 answer:
S_A_V [24]3 years ago
8 0

There are 20 students in the class.

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Represent these consecutive numbers (assuming that they are all integers):

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x+9 is the tenth number.  x+9 = 10, so x = 9.

Think of it this way:  there are 10 consecutive numbers, and the last one is 10.

Working backwards, we get the sequence 10, 9, ... 3, 2, 1.

The sum of such an arith sequence is equal to the count of the numbers times the average of the first and last terms:

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