in a class of 60 junior and senior students, 21 are girls and 34 are juniors and 20 are senior boys. How many juniors are girls?
\(T_b = T_s[60]-T_g[21]\)
\(T_b = 39\)
\(J_b= T_b[39]-S_b[20]\)
\(J_b = 19\)
\(J_g = T_j[34]-J_b[19]\)
\(J_g= 15\)
Answer:
\(15\)