You want total number made in 4 m onths, so adding all numbers is correct, but it is per 1 month, so multiply by 2
A because you need brain for most problems
D works
pick A and D
1.7 = 1.7
8/5 = 1.6
2% = 0.02
2%, 8/5, 1.7
2 (x-20)+2x=38
4x-40=380
4x=420
x=150
The train is 130mph.