Question

Just number 5 please help me :)

Answer 1

Answer:

24 lbs

Step-by-step explanation:

Let Andy's mountain bike weigh ' a' pounds.

The weight of Barry's mountain bike 6 pounds more than Andy's.

This implies that:

$b = a + 6$

If their bikes weigh 42 pounds altogether, then

$a + (a + 6) = 42$

We solve this linear equation:

Group similar terms;

$a + a = 42 - 6$

$2a = 36$

$a = \frac{36}{2}$

$a = 18$

Therefore

$b = 18 + 6 = 24$

Barry's bike weigh 24 lbs