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Math is easy to make mistakes in the primary school graduation exam.
At a given time, the speed of A is one sixth, that of B is one fifth and that of C is two fifths (simplified fraction).

Among them, A accounts for one sixth of 2525.

————-————=————————=————————

1 12 15: 18: 12( 15+ 18+ 12)=45

——:——:——

65 15

B accounts for one fifth: 18 18.

————-————=————————=————————

1 12 15: 18: 12( 15+ 18+ 12)=45

——:——:——

65 15

C accounts for one twelfth: 12 12.

————-————=————————=————————

1 12 15: 18: 12( 15+ 18+ 12)=45

——:——:——

65 15

Usage: 1500 * 65438+45 of 05 = 500 (pieces)

1500 * 18 45 = 600(B)

1500* 12 45=400 (C)

References:

Think with your head! ! !

Please adopt it, I find it difficult to come up with it! ! ! )