IDNStudy.com, ang perpektong platform para sa eksaktong at mabilis na mga sagot. Sumali sa aming interactive na platform ng tanong at sagot para sa mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

If
the sum of 5 consecutive numbers is 95, what is the third number?

Sagot :

Using the formula Sn = n/2(2a + (n-1)d)
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