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The US Air Force has unveiled its newest nuclear stealth bomber, the B-21. The first new bomber in 30 years could cost nearly $700m (£569m) each and can carry nuclear and conventional weapons. The first flight by a B-21 is expected to take place next year. It will eventually replace the B-1 and B-2 models and the fleet is estimated to cost $203bn (£165bn) to develop, buy and operate over 30 years. About US Capital: Washington, D.C. President: Joe Biden Currency: US Dollar
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120, 136, 111, 147, ?, 162
80, ?, 240, 80, 20, 4
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What will come in place of the question mark (?) in the following series?
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