The total attendance for sunday's service was 266.if there were 18more people at the morning service than people at the evening service, how many attended each service

With #! i’ve tried to figure it out but i can’t.

Equation for the calculation double 2 and then add 5

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%