First calculate the numbers of males and females before more members joined. Per 7 females, there are 5 males. 96/12 is 8, and because every 12 people, there are 7 males, 5 males * 8 groups of twelve people is 40, so there were 40 males, and 96 - 40 = 56 females.The total numbers of males and females after the members joined is 96 + 58 =154, and now for every 11 people, 5 are females and 6 are males. 154/11 = 14, so there are 14 groups of 11 people. 14 groups of eleven people * 5 females per group of eleven = 70. 70 females now - 56 females before more members joined = 14. The total numbers of members that joined is 58, so 58 - 14 is 44. The answer is 44 males have joined. I hope this helped! :)