Each student in a math club is in either the Junior section or the Senior section. No student is in both sections. Of the Junior students, 60% are left-handed and 40% are right-handed. Of the Senior students, 10% are left-handed and 90% are right-handed. No student in the math club is both left-handed and right-handed.

The total number of left-handed students is equal to the total number of right- handed students in the math club.

Determine the percentage of math club members that are in the Junior section.