Then, x + 5x + 10x = 480 ⟺ 16x = 480 ⟺ x = 30.
Hence, total number of notes = 3x = 90.
All Except `Raft' are down by animal.
Only '729' is a perfect cube.
This is the only prime number in the group.
All others are soild metals.
Former is the food for latter.
As, 4 : 9 similarly 8 : 13
? ? = 13
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