The phrase "and an increase in the number" is correct and usable in written English.
It can be used when discussing a rise or growth in quantity, often in contexts related to statistics, research, or analysis.
Example: "The study revealed a significant correlation between the two variables, leading to a conclusion of an increase in the number of participants over the years."
Alternatives: "and a rise in the quantity" or "and a growth in the amount".
"And an increase in the number of fragile firms is not in the best interests of the economy".
The revamping includes the addition of a writing component and an increase in the number of years of mathematics covered.
"We believe that the availability of more housing and an increase in the number of jobs are key factors behind this growth".
The centers attributed the pattern to population growth and an increase in the number of elderly patients, with the average age rising from 40 to 43.
The result was the first Democratic Assembly majority in a decade and an increase in the number of legislators who are members of minorities.
The number of women employed is increasing, which reflects both the necessity of two incomes to support families and an increase in the number of women heading households.
For the quarter, both reported a slight slowing of losses, and an increase in the number of people signing up for broadband.
Others included a shift from self-employment to working for bigger companies and an increase in the number of New Yorkers holding more than one job.
In a study of runway safety, the National Transportation Safety Board cited an increased risk of on-the-ground collisions, and an increase in the number of times that planes or trucks blunder onto active runways.
As some local authorities disengage from direct involvement in school improvement – under the combined pressure of budget cuts and an increase in the number of schools outside local authority control – headteachers have been forced to look for alternatives.
Singapore Airlines posted its first profit decline in eight quarters as fuel prices surged and an increase in the number of low-fare competitors caused ticket prices to fall.
