exam Maths Puzzle Numerical Ability

why is division not use in matrices

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exam Other Question

A collection of 15 coins is worth 1.00. If the coins are dimes and nickels, how many of each coin are there?

This is a word problem from Math 100.
Can you please give me the the equation for solving this problem?
5. If a man with blood type A, one of whose parents had blood type O, marries a woman with blood type AB, what will be the theoretical percentage of their children with blood type