Deirdre allocated a certain number of workers to do a construction job on time. She was later informed, however, that the job had to be completed in 1/4 less time and required 1/5 more work than was originally specified. She thus allocated 60 extra workers to ensure that the job would be completed on time. Assuming that all of her workers are equally productive and the speed at which each one works is constant, how many workers did she ultimately allocate to the job?

This one took me way too long. The tricky part is realizing you don't even need to solve for the original number of workers — you can just set up the ratio between the two scenarios and let the original cancel out.

The "1/4 less time" wording messed me up. I read it as time became 1/4 of the original instead of 3/4 of the original. Cost me a whole minute.

Got 180 by setting up W/(0.75T) needs to equal (1.2W)/T scaled by workers. Hard but satisfying once it clicks.

This is a 705+ for sure. The arithmetic itself isn't bad, it's just translating the two changes into the right relationship. Anyone have a clean way to avoid getting lost in the fractions?