Question

If 85 × 5 - 3 = 20 and 18 × 2 - 1 = 10, then 100 × 20 - 5 = ?

• A. 15
• B. 20
• C. 10
• D. 13

Answer 1

Answer:

C. 10

85 × 5 - 3 → 85 ÷ 5 + 3 = 17 + 3 = 20

18 × 2 - 1 → 18 ÷ 2 + 1 = 9 + 1 = 10

100 × 20 - 5 → 100 ÷ 20 + 5 = 5 + 5 = 10