Practicing Success
In a school ratio of no. of teachers, boys and girls was 1 : 7 : 5. When 8 new teachers join and 9 girls left the school the ratio of teacher to student becomes 1 : 7. Find the number of remaining girls in school. |
41 49 56 91 |
56 |
Teacher : Boys : Girls 1 : 7 : 5 ⇓ ⇓ OR Teacher : ↔ Students ↔ ATQ 1 : 12 (7+5) +8 : -9 ---------------------------------------- 1 : 7 Now, \(\frac{1R + 8}{12R - 9}\) = \(\frac{1}{7}\) ⇒ 7 R + 56 = 12 R - 9 5 R = 65 [ No. of girls initially (5)] -9 ---------- 56 [ No. of girls now] |