sorry I realised my answer was wrong, I apologize-
A= c+4+12
a= c+16
a+c= c+16+c+16-16= 2c+16
Well 36 divided by 6 is 6 so multiply that by two and you get 12 14 divided by 6 is 2.3 round that to 2 and multiply it by 2 you get 4 4 +12 is 16 so 16 should be your answer
7.5 divided by 1.5 is 5 so there are 5 lifeguards throughout the day.