there are 12 students in a class . on the day the test was given , ella was absent . the other 11 students took the test and their average was 74 . the next day , ella took the test , and with this grade included , the new average was 75 . what was ella ' s grade on the test ?
11 * 74 + ella ' s grade = 12 * 75 ella ' s grade is 12 * 75 - 11 * 74 = 86 . the answer is e .
add(add(subtract(subtract(add(74, 75), add(11, 12)), 75), add(11, 12)), 11)