It is One hundred and fify trillion in the modern US usage
It is One hundred and fifty billion if you use the old English billion.
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1km is 1000 meters. 150 million km is 150 000 million meters. 150 000 million meters = 150 billion meters. (Careful I'm talking about 150 with 9 zeroes (150 000 000 000). Billion is the US name for that, but other country's names can vary.)
The answer is 15. One fifth of 12,000 is 600. One quarter of 600 is 150. One tenth of 150 is 15 !
Two trillion
18 trillion.
One trillion.