Suppose 2 kg of sugar contains 9×106 crystals. How many sugar crystals are there in 5 kg of sugar?
Let the number of sugar crystals in 5 kg of sugar be be x.
Here weight of sugar and number of crystals are in direct proportion.
∴ 29×106=5x⇒ x×2=5×9×106⇒ x=5×9×1062⇒ x= 22.5×106=2.25×107
Hence, the number of sugar crystals are 2.25×107