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.
An object is said to have an n-fold rotational symmetry if the object, rotated by an angle of , is identical to the original.
Which one of the following objects exhibits 4-fold rotational symmetry about an axis perpendicular to the plane of the screen?
A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (Bl), Green (G), and Black (K). Which one of the following options displays the color codes that are consistent with the color model?