Solution:
"A=2.2 MJ;"
"\\eta=0.11;"
"Q-?;"
The efficiency is calculated by the formula:
"\\eta=\\dfrac{A}{Q};\\implies Q=\\dfrac{A}{\\eta};"
"Q=\\dfrac{2.2MJ}{0.11}=20MJ;"
Answer: "Q=20MJ."
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