Set up a ratio 50 / 130 = x+19 / 78
Cross multiply:
50 * 78 = 130 * x+19
3900 = 130(x+19)
Use the distributive property:
3900 = 130x + 2470
Subtract 2470 from each side:
1430 = 130x
Divide both sides by 130
x = 1430 / 130
X = 11
The answer is B. 11
