18 cattle graze a field in 12 days. 6 cattle graze 3 such fields in how many days ____. A. 90 B. 72 C. 36 D. 108 Explanation: Work ratio method.
15 men can build a 500 m wall in 30 days. How many days will 30 men take to build a 1.2 km wall ____. A. 48 days B. 24 days C. 40 days D. 36 days Explanation: Work ∝ men × days × length.
15 cattle graze a field in 20 days. In how many days will 20 cattle graze the same field ____. A. 30 B. 45 C. 60 D. 50 Explanation: Work ∝ cattle × days → 15×20 = 20×x.
12.5 + 10 1/4 of 100 ÷ 10% of 10 = ____. A. 1037.50 B. 1157.50 C. 103.75 D. 1038 Explanation: Follow the order of operations.
12(13/18) + 16(11/27) − 10(5/9) = ____. A. 182/3 B. 1831/54 C. 18 D. 201/2 Explanation: Simplify fractions.
12 buckets fill the tank; capacity per bucket 13.5 L. Total capacity ____. A. 14 B. 15 C. 16 D. 18 Explanation: Multiply.
12 3/4 × (1 2/17 ÷ 8 1/6) ÷ 5 4/3 = ____. A. 1 B. 27/98 C. 6/17 D. 27/17 Explanation: Convert mixed fractions.