Question

at a camp there is sufficient food for 54 people for 7 days . if 9 more people join the camp , how long will the food last ?

Answer 1

total people=54+9=63
I.e
the time will be =54*7/63 =54/9=6

Answer 2

if the food enough for 54 people for 7 day

and 5 more people join = 54+9 = 63 peoples now

food will long

54×7 = 63 × food for days now

food for days now = (54×7 )/63 = 6

now food is enough for 6 days