Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many number Builts had unit numbers of 375301-310?

### Inputs:
table_name: table, columns: ['Class', 'Type', 'Operator', 'No. Built', 'Year Built', 'Cars per Set', 'Unit nos.']

### Response:
SELECT SUM No. Built FROM table WHERE Unit nos. = 375301-310