SOLUTION: Four times a certain number plus that number equals 50. What is that number ?

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Question 616081: Four times a certain number plus that number equals 50. What is that number ?
Answer by dragonwalker(73) About Me  (Show Source):
You can put this solution on YOUR website!
Give the number a letter, let us call it 'a'.
So we know that 4 times 'a' plus 'a' equals 50
We can write that as 4a + a = 50
we now have to add how many a's so we have 4a + 1a which equals 5a
so 5a=50
but we want to know what 'a' alone is so:
To find this we have to change 5a to 1a and we do that by dividing both sides by 5
5a%2F5=50%2F5
so:
a = 10