Based on the information given the least possible total mass is 255kg.
Lease possible total mass
Since the Five boys have a mass is 10kg. Hence the least possible total mass will be:
40 lies in 35≤x<45
50 lies in 45≤x<55
50 lies in 45≤x<55
60 lies in 55≤x<65
80 lies in 75≤x<85
Hence:
Total mass=35+45+45+55+75
Total mass=255 kg
Inconclusion the least possible total mass is 255kg.
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