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Can someone help me with these questions

 

1) https://vle.mathswatch.co.uk/images/questions/question1004.png      

 

2)https://vle.mathswatch.co.uk/images/questions/question1005.png 

 

3)https://vle.mathswatch.co.uk/images/questions/question15707.png

 

4) https://vle.mathswatch.co.uk/images/questions/question17759.png

 May 7, 2018
edited by Guest  May 7, 2018
 #1
avatar+98061 
+1

1.

 

We have  a total of 10 students  who have either  a brother or a sister....

To find the number that goes  in the middle, x,  we can solve this

 

B  +  S   -  x  = 10

 

9 + 7  - x  =  10

 

16  - x  = 10

 

16  - 10  = x 

 

6  = x

 

Here's the diagram :

 

 

 

cool cool cool

 May 7, 2018
 #2
avatar+98061 
+1

2. 

To find the number of people who use the fitness suite only...we can  take 57 - 36  = 21

To find the number of people who only use the swimming pool, we have 49 - 36 = 13

To  find those that use neither, we have :   100 - 36  - 21 - 13  = 30

 

Here's the diagram :

 

 

 

 

 

cool cool cool

 May 7, 2018
 #3
avatar+98061 
+1

3.

 

 

cool cool cool

 May 7, 2018
 #4
avatar+98061 
+1

4.

 

 

 

 

cool cool cool

 May 7, 2018

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