The phrase "of moderate difficulty" is correct and can be used in written English.
It is typically used to describe the level of difficulty of something, such as a task or activity. Here is an example of how it can be used in a sentence: "The final exam was of moderate difficulty, with a good balance of challenging and straightforward questions."
It's a four-mile walk, of moderate difficulty.
Mr. de Hart recommends a 6.1-mile hike of moderate difficulty that includes the Fallingwater Cascades Trail, the Flat Top Trail and the Cross Rock Trail.
He suggests a six-mile hike that combines the Penns Hill Trail and Morey Road, of moderate difficulty, that can be covered in about four hours.
The hike is of moderate difficulty, but Mr. Kick says it is not necessary to climb to the top of the mountain to catch stark views of Manhattan, about 55 miles to the south.
Two problems were of moderate difficulty, and the last one was the most difficult.
Mixed evidence on this front has arisen from limited observational data and controlled laboratory experiments with problems of moderate difficulty.
The evidence of pre-season matches suggests Hughton has made improving Norwich's defending his priority and he has been rewarded with four clean sheets from six games of low to moderate difficulty.
The majority of our patients at 12 months reported mild to moderate difficulty with this task.
The poorest reported outcome of the OKS was kneeling with patients reporting mild to moderate difficulty with this task (2.6/4; Fig. 1).
This effect was to be expected, because in order to regulate the CCER exam failure rate a considerable number of items of an easy and moderate difficulty had to be included.
Total scores can range from 0 to 80. Function is defined as follows: extreme difficulty or unable to perform activity (0 19 points), quite a bit of difficulty (20 39 points), moderate difficulty (40 59 points), a little bit of difficulty (60 79 points), and no difficulty (80 points).
