Book Maths Puzzle Arithmetic

what is 2/3 of 50

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Book Other Question

2 trapezoid questions what is the sq feet of the following
side 1 base 81 inches
side 2 h 82 inches
side 3 h 58 inches
side 4 angle wall 72 inches
side 1 base 77 inches
side 2 h 36 inches
side 3 h 32 inches
side 4 angle wall 72 inches

thanx
2x^2+5x+3=0