Barry’s mountain bike weighs 6 pounds more than andy’s.

if their bikes weigh 42 pounds altogether, how much does barry’s bike weigh?

if we let a represent the weight in pounds of andys bike then a+6 will represent the weight in pounds of barry's bike

a+(a+6)=42

solve for a.

(a.) 18

(b.) 24

(c.) 6

(d.) 40