How to write an equation:

Forty percent of a number,y, is 48.

40%*y=48

Change % to decimal.
0.40y=48

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To write an equation to solve this problem, you need to translate the given information into mathematical language. Here's how you can do it step by step:

Step 1: Let's represent the unknown number with the variable 'y'.

Step 2: The problem states that 40% of the number 'y' is 48. To express this mathematically, you need to convert the percentage to a decimal. Since 40% is equivalent to 0.40, you can write: 0.40 * y = 48.

Therefore, the equation representing this problem is: 0.40y = 48.