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## Answers

Sn = sum of the series

n = how many terms

a = first term

d common difference

95 = 5/2(2a+(5-1)1)

95 = 5/2(2a+4)

95 = 10a/2 + 20/2

95 = 5a + 10

5a = 95-10

a = 85/5

a = 17

Now you can count up to the third number which is 19 or use formula

an = a+(n-1)d

where n = 3

an = 17+(3-1)1

an = 17+2

an = 19

X+x+1+x+2+x+3+x+4=95
5x +10=95
X=17
Third number, x+2
17+2
=19