If 2.20% of soil is retained on 4.75 mm sieve and 37.36% is retained on the pan after passing the 75 micron sieve, then the sand fraction is
- A2.20 %
- B37.36 %
- C60.44 %Correct
- D35.16 %
Solution
Concept
Sand fraction
Formula
Sand = 100 − gravel − fines
Step-by-step solution
1. Gravel (>4.75 mm) = 2.20%; fines = 37.36%. 2. Sand = 100 − 2.20 − 37.36 = 60.44%.
Explanation
Fractions add up to 100%.
Why the other options are wrong
2.20 and 37.36 are the gravel and fines.
Shortcut
Subtract the other two.
Correct answer: C) 60.44 %