Question

A package of 12 hex bolts and 10 anchor bolts weighs 7 pounds. A second package of 5

hex bolts and 15 anchor bolts weighs 4 pounds. A single hex bolt weighs ___________
pounds, rounded to one decimal place

Answer 1

0.5

Explanation:

• Let h = weight of 1 hex bolt
• Let a = weight of an one anchor bolt

1) (12h + 10a = 7) × 3 ⇒ (1) 36h + 30a = 21

2) (5h + 15 = 4) × -2 ⇒ + (2) - 10h - 30a = 8

----------------------

26h = 13

----- -----

26 26

h = 13 ÷ 13

---

26 ÷ 13

h = 1

---- = 0.5

2

Answer:

1 hex bolt weight 0.5 lbs.