The trapezoidal field's area is (35+48) ÷ 2 × 26 = 1079 square yards The triangular field's area is 39 × 26 ÷ 2 = 507 square yards So totally, the area is 1079 + 507 = 1586 square yards The farmer totally needs 1586÷150 ≈ 10.573 So he need at least 11 bags of fertilizer.
