There were 5 more members in the Choir than in the Robotics Club. There were 32 girls in the Choir Club and 19 girls in the Robotics Club. The number of boys in the Choir Club was 5/7 the number of boys in the Robotics Club. How many members were there in Choir Club?

2/9 of the pupiles in Primary 5 scored an 'A' for a test. The ratio of the number of pupils who scored a 'B' to the number who scored an 'A' was 5:3. The rest of the pupils scored a 'C' and a 'D' in the ratio 6:5. The pupiles who scored a 'B' were 48 more than the pupils who scored a 'C'.

a. How many pupils were their in Primary 5?

b. How many pupils failed the test if the failure was a 'D' grade?