Final answer:
To find the number of pupils who said that Maths was their favorite subject, we subtract the number of pupils who said PE was their favorite subject from the total number of pupils who responded to the survey.
Step-by-step explanation:
According to the given information, 3 pupils said that PE was their favorite subject. However, the number of pupils who said Maths was their favorite subject is not mentioned directly. Therefore, in order to find the number of pupils who said that Maths was their favorite subject, we need to subtract the number of pupils who said PE was their favorite subject from the total number of pupils who responded to the survey.
We can find the total number of pupils who responded to the survey by adding the number of pupils who said PE was their favorite subject (3) and the number of pupils who said English was their favorite subject (135). Hence,
Total number of pupils who responded to the survey = 3 + 135 = 138
Now, to find the number of pupils who said Maths was their favorite subject, we subtract the number of pupils who said PE was their favorite subject (3) from the total number of pupils who responded to the survey (138).
Number of pupils who said Maths was their favorite subject = Total number of pupils who responded to the survey - Number of pupils who said PE was their favorite subject = 138 - 3 = 135