A website Maths Puzzle Logical Reasoning Decision Making and Problem Solving

I've 3 coins - 2 r f equal size and 1 s fake... given a weighing machine, find the fake coin by weighing just once .how?

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A website Other Question

Z, X, S, I, R, R, ?, ?

A. G,I
B. J, I
C. J,K
D. K,M

If a person makes a row of toys of 20 each, there would be 15 toys left. If they made
to stand in rows of 25 each, there would be 20 toys left, if they made to stand in rows
of 38 each, there would be 33 toys left and if they are made to stand in rows of 40
each, there would be 35 toys left. What is the minimum number of toys the person
have?