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B
39
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C
24
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D
28
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E
12
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Solution
The correct option is C 24 Here, the given expression can be rounded off as (18)2−(14)2+(2350+80)÷?=230 or 324−196+(2430)÷?=230 or 2430÷?=230−130 or 2430÷?=100 or ?=2430100=24.3≈24