Verbal Reasoning - Arithmetic Reasoning - Discussion

According to me,

Let a=1/5 b=1/8
LCM =40.

a=1/5*8/8=8/40.
b=1/8*5/5=5/40.

= 8/40+5/40 = 13/40.

Out of 5 girls one girl participated, out of 8 boys one boy participated. so out of 13 students 2 students participated.
Therefore ans is 2/13.

1/5 + 1/8 = 13/40 ratio is correct.

2/10 + 2/16 = 13/40 ratio is coming same.

3/15 + 3/24 = 13/40 ratio is again coming same.

1/x + 1/y = (x+y) /xy.

As 5 and 8 are co-primes.

400 students participated then 130 students participated.

800 students then 260 students participated.

There fore the answer 13/40 is correct as the total students fraction is asked not the ratio of the girls and boys is asked.

(we can distinguish girls and boys numbers separately from this question, that's all).

{this is just like asking; "2 bench and 3 desk together costing 100Rs, then 3 bench and 5 desk costing how much = 160}.

According to me its 13/40.

According to my option it should be 13/40, because
1/5+1/8=13/40

Ya Manika, I agree with u. Why we supposing the number?

Question is only about the total numbers.......

Sajan is correct. They dint give the total number of students. So data inadequate.

Data is inadequate because 1/5 of does not mean that gals are only 5. Same is in boys also.

All the above are correct. Data is inadequate.

I think you are right Sundar, I have seen this question before where the answer was 2/13.