There were 16 problems in the test.
A percentage is a number or ratio expressed as a fraction of 100%.
It is denoted by symbol %.
Let x be the number of problems in the test.
Now it is given that 4 problems were missed by John and 75% was done correctly.
Therefore, Total problems = problem done + problem left
⇒ Percentage of total problems (100%) = 75% + problem left
⇒ Problem left = 100% - 75% = 25%
Now, ∵ Problem left = 4
⇒ 25% of x = 4
⇒ x = 4 × (100/25)
⇒ x = 4 × 4
⇒ x = 16
∴ There were 16 problems in the test.
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