amina thinks of a number and subtracts 5/2 from it she multiplies the result by 8. the answer is 3
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Question 1 :
Amina thinks of a number and subtracts 5/2 from it . She multiplies the result by 8 , the answer is 3 . Find the number .
Solution :
Let the required number be x .
Now ,
According to the question , if 5/2 is subtracted form the number and then multiplied by 8 then resultant is 3 .
Thus ,
=> (x - 5/2) × 8 = 3
=> 8x - (5/2)×8 = 3
=> 8x - 5×4 = 3
=> 8x - 20 = 3
=> 8x = 3 + 20
=> 8x = 23
=> x = 23/8
Hence ,
The required number is 23/8 .
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Question 2 :
Find n if n/2 - 3n/4 + 5n/6 = 21 .
Solution :
We have ;
=> n/2 - 3n/4 + 5n/6 = 21
=> (6n - 9n + 10n) / 12 = 21
=> 7n/12 = 21
=> n = 21 × 12/7
=> n = 3 × 12
=> n = 36
Hence , n = 36 .
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