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

Guest May 7, 2018

edited by
Guest
May 7, 2018

#1**+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 :

CPhill May 7, 2018