What is \[4yd\,1ft - 1yd\,2ft\] ?

Hint: These types of problems are pretty straight forward and are very easy to solve. It can be solved very effectively once we understand the key concepts behind the question. We need to have a clear cut idea of chapters like conversions and SI unit systems. In this particular problem, we first of all need to convert the whole problem into one particular unit and then evaluate the problem. We can convert the two parts of the problem into either yards or into feet and then proceed with it. We can convert yards to feet by following the relation \[1yd=3ft\] and then solve it.

Complete step by step answer:
Now we start off with the solution to the above given problem by writing that, we convert the whole problem into feet and then evaluate the problem accordingly. Let us convert \[4yd\,1ft\] into feet. According to the relation \[1yd=3ft\] , we find that, \[4yd\,1ft=\left( 4\times 3 \right)+1=13ft\] . Moving on to the other part of the equation, we find that, \[1yd\,2ft=\left( 1\times 3 \right)+2=5ft\] . Now we subtract the second part of the equation from the first part to find that,
\[13ft-5ft=8ft\]
We now convert the above found answer from feet to yards and feet. We find that, \[8ft=2yd\,2ft\] . So our answer to the problem is \[2yd\,2ft\] .

Note: Problems of these types can be solved efficiently if we have at least a basic idea of chapters like conversions and unit systems. We need to be very careful while converting from one unit to another and follow the relations of conversion strictly. In this problem as well as any other problem, we convert the whole problem into one particular unit and then evaluate the required things, once we are done we then again convert the answer back to our required form.