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Answer:
360kpa
Explanation:
all those gases are noble gases.they do not react with each other.therefore the the total pressure of the balloon equals to the addition of all individual pressures of the gases.
total pressure=[ pHe+pNe+pAr+pKr]
1000kpa=[350kpa+220kpa+70kpa+pKr]
pKr=360kpa