It takes 15 hours for the master and the apprentice to process a batch of parts. The apprentice processes 30 parts per hour and completes the task at the same time. The number of parts processed by the apprentice is 5 / 9 of the master's

It takes 15 hours for the master and the apprentice to process a batch of parts. The apprentice processes 30 parts per hour and completes the task at the same time. The number of parts processed by the apprentice is 5 / 9 of the master's

Master completes 1 / 15 per hour = 1 / 15
The apprentice's efficiency is 5 / 9 of the master's, 1 / 15x5 / 9 = 1 / 27
That is, the apprentice processes 1 / 27 of the total number of parts per hour
Apprentices process 30 per hour
The total number of parts in this batch is 30 / 27 = 810

The master and the apprentice process a batch of parts. The number of parts processed by the master is 25 more than the total number of 12. The number of parts processed by the apprentice is 13 times that of the master. How many parts are there in total?

Suppose there are x pieces in this batch, we can get the equation: 13 (12x + 25) = 12x-25 & nbsp; & nbsp; & nbsp; & nbsp; 16x + 253 = 12x-25, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 13X = 1003, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 100

The master and the apprentice process a batch of parts. The number of parts processed by the master is 25 more than the total number of 12. The number of parts processed by the apprentice is 13 times that of the master. How many parts are there in total?

Suppose there are x pieces of this batch, we can get the equation: 13 (12x + 25) = 12x-25 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 13X = 1003, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp