anuska scored the following marks in 5 test 87, 75, 79,68,84 what should she score in next test so that her average is higher than 80 marks
if the sum of the 6 scores is greater than 480, then the average is greater than 80
(87 + 75 + 79 + 68 + 84 + x) > 6 * 80
393 + x > 480