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Question 2

Let the number be X

x-3=11

x=11+3

x=15

Therefore the number is 15

Question 4

Let the number be Y

y-(30/100 x y) =28

y-0.3y=28

0.7y=28

0.7y/0.7=28/0.7

y=40

Therefore the number is 40

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