A pilot required to fly a certain number of hours each day flew of the day's required hours plus 2 more in the morning .In the afternoon ,she flew 215 of the day's remaining required hours.In the evening ,she flew 4 remaining hours.Which of the following is closest to the number of hours she flew that day?

A 9

B 10

C 11.5

D 13

Solution

Correct Answer: Option C

মনে করি ,
মোট উড্ডয়ন সময়=x ঘণ্টা
সকালে উড্ডয়ন করে =(x/4) +2
                                =(x+8)/4
অবশিষ্ট =x-(x+8)/4
             =(4x-x-8)/4
             =(3x-8)/4
অতএব ,বিকালে উড্ডয়ন করে =2/5 (3x-8 /10 )
                                              =(3x-8)/10

প্রশ্নমতে, (3x-8)/4 -(3x-8)/10 =4
        বা,{5(3x-8)-2(3x-8)}/20 =4
        বা,15x-40-6x+16=80
        বা,9x=80+40-16
        বা,9x=104
        বা,x=11.55
         বা,x≈11.5 ঘণ্টা

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