Can you pass the three questions in the world’s quickest IQ test?

Rob Waugh

Is your intelligence above average?

Most IQ tests involve pages and pages of questions, many of which seem to involve strange shapes.

But there’s a simpler test for intelligence, which has been circulating this week in the wake of Donald Trump’s offer to take an IQ test.

The Congnitive Reflection test was designed by psychologist Shane Frederick in 2015, and is a series of three simple questions, designed to work out if someone is of above-average intelligence.

It’s built to test intelligence by seeing if people can override their own ‘gut instinct’ – and avoid an obvious, but wrong answer.

The Cognitive Reflection Test

1. A bat and a ball cost £1.10 in total. The bat costs £1.00 more than the ball. How much does the ball cost?

2. If it takes five machines five minutes to make five widgets, how long would it take 100 machines to make 100 widgets?

3. In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?


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Mensa, an exclusive group whose members score in the top two-percent of IQ tests, said politicians are welcome to be members. Matt Yurus reports.

1 5 pence (not 10)
2 5 minutes (not 100)
3 47 days (not 24)

In question one, the bat costs £1,00 MORE than the ball. If the ball cost 10p, it would only cost 90p more

In question two, each machine takes five minutes to make a widget, so 100 machines will take five minutes, just as five machines do.

In question three, the patch doubles every day, so, going backwards in time, it halfs in time every day, hence the lake will be half-covered on day 47