A) 80 points
B) 10 points
C) 12 points
D) 72 points
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Since A can give B 20 points and C 28 points, the minimum number of points C has is 28. And if B can give C points, the maximum number of points B has is 28+10=38 So A has 20+38=58 points
The correct answer is option B) 10 points
If A can give B 20 points and C 28 points, then B has 20 points left after giving A 20 points. And if B can give C the same amount of points that C gave to B, then B can give C 10 points.
B has 20 points – 20 points (what B gave to A) = 0 remaining points
C gave B 28 points – 10 points (what B gave back to C) = 18 points remaining
Explanation
A) 80 points: This answer is incorrect because it is not possible for B to give C 80 points. If A can give B 20 points and C 28 points, B would have no points left to give C after giving A 20 points.
B) 10 points: This answer is correct because if A can give B 20 points and C 28 points, then B can give C 10 points. B has 20 points – 20 points (what B gave to A) = 0 remaining points, C gave B 28 points – 10 points (what B gave back to C) = 18 points remaining
C) 12 points: This answer is incorrect because if A can give B 20 points and C 28 points, then B can give C 10 points. B has 20 points – 20 points (what B gave to A) = 0 remaining points, C gave B 28 points – 10 points (what B gave back to C) = 18 points remaining
D) 72 points: This answer is incorrect because it is not possible for B to give C 72 points. If A can give B 20 points and C 28 points, B would have no points left to give C after giving A 20 points.