The design of a microchip has the scale 40:1 . The length of the design is 18cm , the actual length of the microchip is 9m , then m = ?
![A uniform meter scale balances at the 40 cm mark when weights of 10g and 20g are suspended from the 10cm and 20cm marks. The weight of the metre scale is A uniform meter scale balances at the 40 cm mark when weights of 10g and 20g are suspended from the 10cm and 20cm marks. The weight of the metre scale is](https://d10lpgp6xz60nq.cloudfront.net/web-thumb/16978653_web.png)
A uniform meter scale balances at the 40 cm mark when weights of 10g and 20g are suspended from the 10cm and 20cm marks. The weight of the metre scale is
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