Clear biomechanics in badminton #shorts

A shuttle cock used for playing badminton has the shape of the combintion of

Out of 85 children playing badminton or table tennis or both, the toatl number of girls in the group is 70% of the total number of boys in the group. The number of boys playing only badminton is 50% of the number of boys and the total number of boys playing badminton is 60% of the total number of boys. The number of children playing only table tennis is 40% of the total number of children and a total of 12 children play badminton and table tennis both. The number of girls playing only badminton is