solve question no 19,20
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19)
A union B : 150
A : 0.62 * 150
B : 0.68 * 150
A intersection B = A + B - A union B
= (0.62 * 150) + (0.68 * 150) - 150
= (0.62 + 0.68 - 1) * 150
= (0.5)* 150
Ans = 75 students are studying both subjects.
20)
Exposed body = 2/9
Submerged body = (9-2)/9
= 7/9
Submerged : Exposed ratio = (7/9)÷(2/9) = 7/2
A union B : 150
A : 0.62 * 150
B : 0.68 * 150
A intersection B = A + B - A union B
= (0.62 * 150) + (0.68 * 150) - 150
= (0.62 + 0.68 - 1) * 150
= (0.5)* 150
Ans = 75 students are studying both subjects.
20)
Exposed body = 2/9
Submerged body = (9-2)/9
= 7/9
Submerged : Exposed ratio = (7/9)÷(2/9) = 7/2
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