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Question

x is defined as 50% of 30. Then find the value of x2+5x220


A

78

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B

86

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C

90

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D

80

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Solution

The correct option is D

80


50% of 30=50100×30=15

Putting x=15 in x2+5x220

we get : 152+5(15)220

= 225+75220=300220=80

= 80


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