Posted by TSN on .
The average score on a reading test for 58 students was 87.3. Twelve more students took the test. The average of the 12 students was 90.7. What was the average for all students?

math 
Ms. Sue,
58 * 87.3 = 5063.4
12 * 90.7 = 1088.4
5063.4 + 1088.4 = 6,151.8
6,151.8 / 70 = 87.9