exam Maths Puzzle Numerical Ability

6/100= 3/50
proportion true or false?false

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exam Other Question

Multiply: 7u^6 * 4u^3
Multiple choice answers.
A) 11u^9
B) 11u^18
C) 28u^18
D) 28u^9

I get 28u^18 is this right? 2/3k=3/4 its been years and i cant remember the correct way to find what k is . thanks