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Question

What should be subtracted from −78 so as to get 512?

A
3124
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B
85
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C
3124
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D
68
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Solution

The correct option is D 3124
Let the number be x to be subtracted from 78 to get 512. Then it can be solved as follows:

78x=51278x=512x=78512x=7×38×35×212×2
x=21241024x=211024x=3124

Hence, x=3124

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