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In a row of 45 students, facing north, Kevin is 16th from the right end. If Luther is 10th to the left of Kevin, what is Luther's position from the left end of the row?
20th
21st
22nd
23rd
20th
In a row, the position from the left end = (Total students - Position from right end) + 1. Calculate Kevin's position from the left first, then subtract 10.
In a row, the position from the left end = (Total students - Position from right end) + 1. Calculate Kevin's position from the left first, then subtract 10.
Find Kevin's position from the left
Total students = 45. Kevin is 16th from the right. Position from left = (Total - Right Position) + 1 = (45 - 16) + 1 = 29 + 1 = 30th.
Find Luther's position from the left
Luther is 10th to the left of Kevin. Since Kevin is at the 30th position, Luther = 30 - 10 = 20th position from the left end.
B: 21st is incorrect as it implies a different offset. C: 22nd is incorrect. D: 23rd is incorrect.
A is correct because calculating Kevin's position from the left (45 - 16 + 1 = 30) and subtracting 10 gives 20, which is Luther's position.
Remember that in a row of N people, the sum of positions from left and right is always N + 1.
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