If the required fraction be P
According to the question
(P x P) / (1/P) = 18²⁶/₂₇

Correct Option: C

If the required fraction be P
According to the question
(P x P) / (1/P) = 18²⁶/₂₇
⇒ P³ = 512/27
∴ P = 8/3 = 2²/₃

Let number of boys in school are B and Girls are G.
Total number of students participated
= (B x 1/4 + G x 3/8)
= (B/4 + 3G/8)
∴ Required percentage
= ((B/4 + 3G/8)/(B + G) x 100%)

Correct Option: D

Let number of boys in school are B and Girls are G.
Total number of students participated
= (B x 1/4 + G x 3/8)
= (B/4 + 3G/8)
∴ Required percentage
= ((B/4 + 3G/8)/(B + G) x 100%)

Clearly, given data is inadequate.

If the fraction a/b is positive, then a > 0 and b > 0 .

Correct Option: C

If the fraction a/b is positive,
then a > 0 ..............(i)
and b > 0 ..............(ii)
Multiply (i) and (ii)
So ab > 0 must be true.

Let the amount be ₹ a
According to the question,
a x 5/12= 3³/₄ x 100
solve the equation.

Correct Option: A

Let the amount be ₹ a
According to the question,
a x 5/12= 3³/₄ x 100
⇒ 5a/12 = 15/4 x 100
⇒ a = 12/5 x 15/4 x 100
⇒ a = 12 x 15 x 100/4 x 5
∴ a = ₹ 900

0.2341 = (2341 - 2) / 9990 = 2339/9990

Correct Option: D

0.2341 = (2341 - 2) / 9990 = 2339/9990