Given the fraction of the students that can recognize all 26 letters, the number of student that still needs to learn the entire alphabet is 21.
Given that;
Number of students enrolled (no English) at ABC n = 150
6/7 of the students can recognize all 26 letters.
Number of students that can recognize all 26 letters will be;
6/7 × n = ?
6/7 × 150 = 128.6 ≈ 129
Now, the number of student that still needs to learn the entire alphabet will be;
x = n - Number of students that can recognize all 26 letters
x = 150 - 129
x = 21
Therefore, given the fraction of the students that can recognize all 26 letters, the number of student that still needs to learn the entire alphabet is 21.
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