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Step-by-step explanation:
1.
Let the number be x
By the problem,
8(x-5/2) = 3x
=> 8x-20 = 3x
=> 8x-3x = 20
=> 5x = 20
=> x = 4
Ans. The number is 4
2.
Let the numbers be x and 5x
By the problem,
5x+21 = 2
x+21 1
=> 5x+21 = 2x+42
=> 5x-2x = 42-21
=> 3x = 21
=> x = 7
The numbers are x and 5x
= 7 and 35
Ans. The numbers are 7 and 35
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