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GMAT Science — practice by topic

Browse 3 questions across 1 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Science topics

Chemical Changes, Reactions & Atmospheric Pollution (3)

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A 60 kg milk container has 6 kg replaced with water, repeated twice more. Milk left is:Read the answer and worked solution →Mix 10 L of 20% acid with 30 L of 60% acid; final %:Read the answer and worked solution →Coffee at ₹120/kg mixed 1 : 3 with ₹80/kg. Mix price:Read the answer and worked solution →

Worked practice questions

A 60 kg milk container has 6 kg replaced with water, repeated twice more. Milk left is:

  1. 34.24 kg
  2. 39.64 kg
  3. 43.74 kg
  4. 47.60 kg
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Correct answer: C. 43.74 kg

1. After each replacement, milk fraction multiplies by (60 − 6)/60 = 54/60 = 0.9. 2. After 3 replacements: milk = 60 × 0.9³ = 60 × 0.729 = 43.74. 3. Therefore 43.74 kg remains. _Source: KMAT Karnataka 2021 PYQ Q.40_

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Mix 10 L of 20% acid with 30 L of 60% acid; final %:

  1. 40%
  2. 50%
  3. 45%
  4. 55%
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Correct answer: B. 50%

1. Acid = 2 + 18 = 20. 2. 20/40 = 50%. _Source: 501-GMAT-Questions Section 4 / Manhattan Quant Bank_

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Coffee at ₹120/kg mixed 1 : 3 with ₹80/kg. Mix price:

  1. ₹100/kg
  2. ₹85/kg
  3. ₹95/kg
  4. ₹90/kg
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Correct answer: D. ₹90/kg

1. Weighted avg = (1·120 + 3·80)/4 = 360/4 = 90. _Source: 501-GMAT-Questions Section 4 / Manhattan Quant Bank_

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