A crate weighs 6 kg when empty. A lemon weighs about 0.2 kg. For economical shipping the crate with lemons must weigh at least 45kg. How many lemons should be put in the crate?

Let x be the number of lemons

6 + 0.2x > or = 45

subtract 6 from both sides

0.2x > or = 39

Divide both sides by 0.2

(:0.2 : 0.2)

x > or = 195

Therefore the minimum number of lemons must be 195