Let A, B, C, D, and E represent the number of cards each person has.
Statement 1: "If you give me three cards, you will have as many as E has."
B - 3 = E (Equation 1)
Statement 2: "If I give you three cards, you will have as many as D has."
B + 3 = D (Equation 2)
Statement 3: "A and B together have 10 cards more than what D and E together have."
A + B = D + E + 10 (Equation 3)
Statement 4: "B has two cards more than what C has."
B = C + 2 (Equation 4)
Statement 5: "The total number of cards is 133."
A + B + C + D + E = 133 (Equation 5)
From (Equation 1): E = B - 3
From (Equation 2): D = B + 3
From (Equation 4): C = B - 2
Substitute into: A + B = (B + 3) + (B - 3) + 10
A + B = 2B + 10
A = B + 10
Substitute A = B + 10, C = B - 2, D = B + 3, and E = B - 3 into (Equation 5):
(B + 10) + B + (B - 2) + (B + 3) + (B - 3) = 133
Simplify:
5B + 8 = 133
5B = 125
B = 25
The number of cards D has is 25.
Eight students (P, Q, R, S, T, U, V, and W) are playing musical chairs. The figure indicates their order of position at the start of the game. They play the game by moving forward in a circle in the clockwise direction.
After the 1st round, the 4th student behind P leaves the game.
After the 2nd round, the 5th student behind Q leaves the game.
After the 3rd round, the 3rd student behind V leaves the game.
After the 4th round, the 4th student behind U leaves the game.
Who all are left in the game after the 4th round?
