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Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).

Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).

Grade:11

1 Answers

NANDA
18 Points
10 years ago
Wow thats something great do you think so its so obious even for a 6th standard guy

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