Question

A baker uses 30 grams of sea salt for each batch of bread. Sea salt comes in an 18-kilogram package or 800 gram package. Which size package should the baker buy so that their will be no sea salt left over after making batches

Answer 1

Since 18 kilograms are 18000 grams, you have

$\dfrac{18000}{30} = 600$

and

$\dfrac{800}{30} = 26.\overline{6}$

So, with 18 kilograms of salt the baker can make exactly 600 batches with no leftovers, while with 800 grams of salt the baker can make 26 batches, with some leftovers.

In fact, 26 batches require

$26 \times 30 = 780$

grams of salt, and the remaining

$800-780=20$

grams of salt are not enought to prepare the next batch

Answer 2

The baker should buy the package with 18kilograms which equals to 18,000 grams. 18,000/30 equals 600, while 800/30 equals 26 with leftovers