Question

Aditya takes 20 coins from a box, and he gets 12 red coins and 8 black coins. If the whole box contains 10000 coins, about how many of them are black.

Answer 1

Finding number of coins

Given: Aditya takes 20 coins from a box, and he gets 12 red coins and 8 black coins.

To find: If the whole box contains 10000 coins, about how many of them are black?

Solution:

Given that, there are 12 red coins and 8 black coins in 20 coins.

Ratio of red and black coins is 12 : 8

• Fraction for red coins = 12/20
• Fraction for black coins = 8/20

Now we find the number of red and black coins in 10000 coins:

• In 10000 coins, the number of red coins is 10000 × 12/20 = 6000
• In 10000 coins, the number of black coins is 10000 × 8/20 = 4000

Answer: 4000 of the total coins are black.