Answers

2016-07-31T16:38:17+08:00
190 over 2 or 85.
wala akong papel eh
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2016-07-31T16:55:48+08:00
Since all of them are similar fractions, it's basically asking for the summation of all the odd numbers from 1 to 20 (based on the pattern) and divide the answer by 2
You can use manual addition or the formula for the summation of arithmetic series; which is:
Sn = n [2a + (n-1)d] all over 2
where n = 10 since there are 10 odd numbers from 1 to 20
a = 1 which is the first term in the arithmetic series
d = 2 which is the distance between the terms *3-1=2
Sn = 10 [2(1) + (10-1)2] all over 2
Sn = 10(2+18) all over 2
Sn = 10(20) all over 2
Sn = 200/2 = 100
100 is the sum of all the numerators
Now we divide it by the denominator 2; 100/2 = 50
The answer is 50

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