15 is 2 1/2 of a number 6.
We need to find that 15 is 2 1/2 of what number.
What is the meaning of 'of' in maths?
In math, 'of' is also considered one of the arithmetic operations which means multiplication within the brackets.
Let the unknown number be y.
Now, 2 1/2 of y=15
⇒5/2 ×y=15
⇒y=6
Therefore, 15 is 2 1/2 of 6.
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