Answer:
There were 693 students before the increase.
Step-by-step explanation:
You just take 90 percent of 770, which is 770 * 0.90 = 693.
Answer: there were 693 students before the increase
Step-by-step explanation: as it increased by 10% it is the 10% of 770 students. So the 10% would make up to 77 students increase.(77÷100×770) Then you subtract 77 by the 770 to derive the number of students before increase which gives us 693.