Answer:
59
Step-by-step explanation:
1) so you start with the mean being 72x5=360
2)100+42+87+66=295
3) 360-295=65
(you get the 5 from the amount of numbers there are) P.S sorry if I'm wrong or this doesn't help
multiply 365 by 8
365 * 8 = 2920
so yes it is reasonable
formula= LCM ×GCD of the numbers ÷ The first number