Multiple choice

In a garden, a fertilizer mixture consists of two types, A and B, in a container with a total volume of 110 liters. The initial ratio of fertilizer A to fertilizer B is 4 : 7. After adding some amount of fertilizer B, the new ratio becomes 4 : 9. What is the amount of fertilizer B added?

  1. 2 liters

  2. 3 liters

  3. 10 liters

  4. 20 liters

  5. 12.5 liters
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial: A = 40, B = 70 (Total 110). New ratio A:B = 4:9. Since A remains 40, 4 units = 40, so 1 unit = 10. New B = 9 * 10 = 90. Added B = 90 - 70 = 20.

AI explanation

In a 110 liter mixture with a ratio of 4:7, fertilizer A is 40 liters and fertilizer B is 70 liters. When more of B is added, the amount of A remains 40 liters; this corresponds to 4 parts in the new ratio, so 1 part is 10 liters. The new amount of B is 9 parts or 90 liters, meaning the amount added is 90 minus 70.

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