2years ago my mother was 4 times my age then. in 18 years i will be half my mothers new age. how old am i now?
i am so stuck 2 years ago sx4-m (s+18)=(m+18)/2 now what do i do

Amajor grocery store chain is trying to cut down on waste. currently, they get peaches from two different distributors, whole fruits and green grocer. out of a two large shipments, the manager randomly selects items from both suppliers and counts the number of items that are not sell-able due to bruising, disease or other problems. she then makes a confidence interval. is there a significant difference in the quality of the peaches between the two distributors? 95% ci for pw-pg: (0.064, 0.156)