Final answer:
The number you are thinking of could be 24 or 54.
Step-by-step explanation:
The number you are thinking of is a multiple of 6 and is also 1 less than a multiple of 5. To find a number that satisfies these conditions, we need to find the least common multiple of 6 and 5.
The multiples of 6 are: 6, 12, 18, 24, 30, ...
The multiples of 5 are: 5, 10, 15, 20, 25, ...
From these lists, we can see that the numbers that are both multiples of 6 and 1 less than a multiple of 5 are: 24 and 54.
So, the possible numbers you could be thinking of are 24 and 54.