X is a measure of protection which is found on personal care products. There is a common misconception that X represents the number of minutes or hours of protection provided.
In reality, X is a relative number for the amount of protection provided, with the product only allowing for 1/X harmful effects. Hence, higher numbers don’t necessarily mean a significant protection.
Can you identify X?
| X | %Protection |
| 2 | 50% |
| 5 | 80% |
| 15 | 93.33% |
| 30 | 96.67% |
| 50 | 98% |