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Maths;; External Transfer Also known as Everything Change. This concept is pretty useful, it can be used in almost all Maths questions, as long as there is at first, the change, and the final. It also can be used in Before-After concept and differences remain the same concept. (: Now, let's look at the below example:
First of all, we have to draw out a simple table to show the relationship between Brand A and B.
The name we use in the initial is parts whereas the name in final used is units, so that we won't confuse ourselves. Next step, we make the Final units in Brand A and B the same. So, in A, 4 x3 and in B, 3 x 4. Also, do this to the rest of the stuff. (Initial and change)   Now you should able to see the light since the final units are the same. If not, you can draw out a model to help yourself to see clearer of what is happening.
You should able to see that 1 part = 48-40. 48-40=8 (1 part) Now the question is asking for: How many Brand B laptops did the store had at first? Thus, we look at what we have at first in our FIRST table, which is 5 parts. We CANNOT look at the 2nd table. Remember ar.. So, we look for 5 parts. 8 x 5 = 40 |
