Answer:
Step-by-step explanation:
x + y + n = 576
When something is 25% larger than something else, the effect is the same as multiplying by 1.25. Let's try it with an example
20 + (25/100)* 20 = 20 + 500/100 = 20 + 5 = 25. Now if you multiply 20 * 1.25 you get 25 which is just what you should get.
n = 1.25(x + y) Divide by 1.25
n / 1.25 = x + y Substitute n / 1.25 for x + y in the above equation
n/1.25 + n = 576 Multiply everything by 1.25
n + 1.25n = 576*1.25 Combine the left to get 2.25
2.25 n = 576 * 1.25 Divide by 2.25
n = 576*1.25 / 2.25
n = 320
