word problems...........
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Maxx allowed member to pool for swimming is = 60
for every 15 members there is 1 lifeguard so maximum number of lifeguard = 60/15 = 4 ( answer A)
now applying second condition
for rotation they adding 6 more lifeguards
so total lifeguard = 4+6 ( but they are for rotation )
every 4 of them takes place on rotation
so new hired lifeguard - available for rotation ( 4 lifeguard which are working there before them )
6-4 = 2
Maxx number of lifeguard + 2 + assistant manager + manager ...
4+2+1+1 = 8 staff members
hope it helps