Answer:
<h2><em><u>hope </u></em><em><u>it </u></em><em><u>helps </u></em><em><u>you </u></em><em><u>see </u></em><em><u>the </u></em><em><u>attachment </u></em><em><u>for </u></em><em><u>further </u></em><em><u>information </u></em></h2>
For a string length of 1 there are 2 possible strings (2^1)
for a string length of 2 there are 4 possible strings (2^2)
for a string length of 3 there are 8 possible strings (2^3)
So, for string length of 7 there are 128 possible strings (2^7)
The number of boys wear glasses are 156 boys.
In this question,
Total number of pupils in the school = 910
Ratio of boys = 3/7
Then, number of boys = 910 × 3/7
⇒ 130 × 3
⇒ 390
Ratio of boys wear glasses = 2/5
Then, number of boys wear glasses = 390 × 2/5
⇒ 78 × 2
⇒ 156
Hence we can conclude that the number of boys wear glasses are 156 boys.
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