**Quote:**

more than twice the 3 number makes the question confusing. looks like there is a typo.

yes 3 was at a wrong place. it is fixed now

total number of students =\(30\)

total number of students that are not juniors or seniors = \(3/10 * 30 = 9\)

no of juniors + no of seniors = \(21\)

Let

j = no of juniors

Let

s = no of seniors

we have \(j+s = 21\).........(i)

from question we get, \(2*j + 3 = s\)......(ii)

replace the value of s from eqn (ii) in (i)

\(j+ 2j +3 = 21\)

solve for \(j; j=6\)

option c

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This is my response to the question and may be incorrect. Feel free to rectify any mistakes

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