The Solutions to Problems.

Sum of 1's and zero is 12

Build a house in 4.8 days

Difficult Problem solution.

Let D= Derek’s age, B= Bill’s age and x= the number of years ago when Derek was as old as Bill is now.

1.        1.           D=2[B-x]

2.        2.           D+B= 56 

3.        3.           D-x= B

Solve D=32 B=24

The difficulty is in the wording but the wording is correct. This comes from Bolton University 

 Level 5 Course in Maths Specialism.

Bill