Simplicity



Put your image codes here
Maths;; Difference remains the same


This concept applies to a lot of stuff. It is just if you can see it or not.
  • Age
  • When a same number is removed/added

Now let's look at the below example for AGE:



Aminah's mother is 38 years old. Aminah is 8 years old. How old will Animah be when her mother is 3 times as old as she is?


When we have an age question, note that when some one is older by one year, the other person also grows old by 1 year. In this case, for example, 2 years later, Aminah's mother will be 40 years old whereas Aminah will be 10 years old. When the same number increase/decreases, the difference remains the same. Thus, now we have to find the difference between Aminah's mother and Aminah herself.


38 - 8 = 30

Then we draw a model to explain the relationship between Aminah and her mother's age.


Now, it is obvious that 2 units is 30. (3units - 1 unit = 2 units) Thus, find 1 unit.

30 / 2 = 15

You can either choose Aminah or Aminah's mother to compare. I chose Aminah because it is easier. We have to find the grey shaded part (indicated in the model). So, we take 15-8, 8 comes from the age at first.

15 - 8 = 7

But wait, want to check if your answer is correct? Well then, let's take Aminah's mother model to compare. Since 1 unit is 15, we find 3 units.

15 x 3 = 45

Then we minus the age she had at first again, which is 38.

45 - 38 = 7

So, it is absolutely correct that the final answer is 7.