Question

Ruben bought 6 new books for his collection. This increased his collection by 12% How many books did he have before this purchase? Please explain

Answer 1

50 books

Explanation:

Forming the equation,

→ x + ((x/100) × 12) = x + 6

Now the value of x will be,

→ x + ((x/100) × 12) = x + 6

→ x - x + (12x/100) = 6

→ 0.12x = 6

→ x = 6/0.12

→ [ x = 50 books ]

Hence, answer is 50 books.

Answer 2

• Ruben had 50 books

Explanation:

Let the initial number of books be x.

Set equation:

• x + 6 = x + 12%
• x + 6 = x + 0.12x
• 0.12x = 6
• x = 6/0.12
• x = 50