2002
Mathematics
67ca00ce0c643c71d77dee1f
The distribution above shows the number of days a group of 260 students were absents from school in a particular term. How many students were absent for at least four days in the term
A.
210
B.
40
C.
120
D.
160
Correct Answer: 160
Explanation
20 + X + 50 + 40 + 2X + 60 = 260 3X + 170 = 260 3X = 260 - 170 3x = 90 x = 30 Absent for at least 4 days 4, 5, 6 40, 2x, 60, i.e 40 + 2x + 60 = 40 + (2 x 30) + 60 = 40 + 60 + 60 = 160
20 + X + 50 + 40 + 2X + 60 = 260 3X + 170 = 260 3X = 260 - 170 3x = 90 x = 30 Absent for at least 4 days 4, 5, 6 40, 2x, 60, i.e 40 + 2x + 60 = 40 + (2 x 30) + 60 = 40 + 60 + 60 = 160THIS WEEK's
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