There are two numbers on the screen - one in the blue and the other in the red box. In the beginning, both numbers are the same. With each beep, both numbers increase - by 1 in the blue field and by 3 in the red field. At one point, the number 49 appears in the blue field, and the number 129 appears in the red field. Find what numbers were initially in both boxes.

Correct answer:

a =  9

Step-by-step explanation:

a+3b = 129

a+3·b = 129

a+b = 49
a+3b = 129

Row 2 - Row 1 → Row 2
a+b = 49
2b = 80

b = 80/2 = 40
a = 49-b = 49-40 = 9

a = 9
b = 40

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