exam Maths Puzzle Numerical Ability

The number 64 is divisible by its units digit (4). How many whole numbers less than 64 are divisible by their respective units digit?

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exam Other Question

tn= 2x+(n-1)5x
can you please formulate this for me. step by step on how to solve this problem?
Please help I have been trying to figure this problem out but am unable to even get started

-9x+2y=2
+6x+8y=-6