Jared had $300. Since he spent 1/4 of his money, $75 is one piece of those. When you multiply 75 x 4, you will get $300. To check your work, you can do $300 ÷ by 4 (the denominator) and you will get $75.
Another way is to change the fraction. Write 1/4 down first. 1 x 75 = 75 4 x 75 = 300.
When changing the fraction (if you want to do this way), you want to make sure that if they tell you (for example) "Dorothy spent $10. That is 1/2 of her money in her piggy bank. How much did she have at first?"
You want to make sure that the numerator is the same as the number that they told you, in this case, it's 10. You would multiply both the numerator and denominator by 10. The answer for Dorothy would've been $20.
But, the answer for your question is that Jared had $300. Sorry for the amount of explanations and it may be confusing, but I hope I helped! :-)
