exam Maths Puzzle Numerical Ability

wats the dot mean in between 2 numbers wen given a equation......????? i really wanna kno let me give u a example 3.5 *4.6

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how do you do 5 with a 2 up to the right - 3 with a 2 up to the right + 4 with a 2 up to the right = ? There are initially 3 E-coli bacteria present in a hamburger. If the doubling time for E-coli is 5 minutes, how many E-coli bacteria will be present after 20 minutes?