Question

A builder buys bricks at the rate of $4.50 per brick for the first 10, $3.50 per brick for the next 10, and $2.50 for any additional bricks. how many bricks can be bought for $100?

Answer 1

If the first 10 bricks come out at $ 4.5, I would be spending $ 45. The other 10 bricks come out at $ 3.5 so he would be spending $ 35. Therefore, he has $ 20 available to buy bricks at $ 2.5, which would be buying 8 additional bricks. Thus, in total, with $ 100, 28 bricks were purchased.

Answer 2

Multiplication is the process of multiplying. The number of bricks that the builder can buy-in $100 is 8.

What is multiplication?

Multiplication is the process of multiplying, therefore, adding a number to itself for the number of times stated. For example, 3 × 4 means 3 is added to itself 4 times, and vice versa for the other number.

The cost of the first 10 bricks will be,

Cost of first ten bricks = ($4.50 × 10) = $45

The cost of next 10 bricks will be,

Cost of next ten bricks = ($3.50 × 10) = $35

The total amount that is been used to buy these 20 bricks will be,

Amount left = $100 - $45 - $35 = $20

Since after these 20 bricks, the cost of each brick will be 2.50, therefore, the number of bricks that can be bought in $20 is,

Number of bricks that can be bought = $20 / $2.5 = 8

Hence, the number of bricks that the builder can buy in $100 is 8.

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