Final answer:
Cooper saved $378 in April.
Step-by-step explanation:
Let's assume that Cooper saved $x in March. According to the bar model, he saved 3 times as much in April. So, he saved $3x in April.
The total amount saved during these months is $504. Therefore, the equation we can form from this information is:
x + 3x = 504
Combining like terms, we get:
4x = 504
Dividing both sides by 4, we find:
x = 126
So, Cooper saved $126 in March. To find out how much he saved in April, we can substitute this value into the equation:
3x = 3 * 126 = 378
Therefore, Cooper saved $378 in April.