Answer:
<em>680</em>
Step-by-step explanation:
Given that:
All the pupils at a primary school come from one of three villages: Elmswell, Haughley or Woolpit.
of the pupils come from Elmswell
of the pupils come from Haughley
102 pupils come from Woolpit.
To find:
Total number of pupils in the school.
Solution:
Let total number of pupils = 
So, number of pupils that come from Elmswell =
of 100x
OR

And, number of pupils that come from Haughley=
of 100x
OR

Number of pupils that come from Woolpit = 
As per given statement:

Number of pupils from Elmswell = 25x = 25
6.8 = 170
Number of pupils from Haughley = 60x = 60
6.8 = 408
Total number of pupils at the school = 