Click ‘more…’ to read the solution.

The correct answer is 4.

Solution:

First find
100%. We know that 50% is 10, so 100% must be 20.

Now, we
also know that 3x is 60%, but what percentage is 1x?

60% / 3 = 20%

Because 20%
is 100% divided by 5, we can divide 20 (which is 100%) by 5 to find 20%:

20 / 5 = 4.

So, x = 4.

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