Question

Rajesh and his brother Mohib are each mailing a birthday gift to a friend. Rajesh package weights 3 more pounds than twice the weight of Rajesh package.the combined weight of both packages is 15 pounds

Answer 1

let the weight that Mohib packs be x, weight that Rajesh packs will be 2x+3.
the total weight will be:
x+(2x+3)=15
solving for x we get
x+2x+3=15
3x=15-3
3x=12
x=12/3
x=4

Mohib packaged 4 pounds while Rajesh packaged 2*4+3=11 pounds

Answer 2

I assume the question was meant to read: Rajesh package weights 3 more pounds than twice the weight of Mohib. Let Mohib's package weigh x. Then Rajesh package weighs 2x + 3
 So their combined package weighs x + (2x + 3) = 15
 So we have x + 2x + 3 = 15
3x + 3 = 15
 3x = 15 - 3 = 12
 x = 4
 So Mohib's package is 4 and Rajesh package is (2*4) + 3 = 11