Ok the answer of 6 are 12, 18, 24, 30, 36, 42, and 48. The multiples of 9 are 18,27,36,45,54,63,72,81,90,99,108,117,126,135,144,153,162,171,180,189,198,. Hope it helps!
Let, the no. of adults be "x" then, the no. of childern = total people - total adults = (30 - x) Now, According to the quesiton, 2 (30 - x) + 5x = 87 60 - 2x + 5x = 87 60 + 3x = 87 3x = 87 - 60 3x = 27 x = 27 / 3 x = 9 So, there were 9 adults in the group
