Question

andy is 5 kilogram less than twice his brother's. together they weigh 100 kilograms what are they weights

Answer 1

Let x be the brother's weight.
Then 2x-5 is Andy's weight.
x+(2x-5)=100
3x-5=100
3x=105

Answer 2

Andy is 45 kilograms and his brother is 55 kilograms. 55+45=100