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The Guardian - UK
The Guardian - UK
Science
Alex Bellos

Did you solve it? The man who made India’s trains run on time

India
Nilgiri Mountain Railway, moving through a tea estate, Nilgiris, Tamil Nadu, IndiaG0TN2T Nilgiri Mountain Railway, moving through a tea estate, Nilgiris, Tamil Nadu, India
Nilgiri Mountain Railway, moving through a tea estate, Nilgiris, Tamil Nadu, India
G0TN2T Nilgiri Mountain Railway, moving through a tea estate, Nilgiris, Tamil Nadu, India Photograph: Bhaswaran Bhattacharya/Alamy

Earlier today I set you five problems from Creative Puzzles to Ignite Your Mind, a book of puzzles by Shyam Sunder Gupta, former Principal Chief Engineer of Indian Railways. Here they are again with solutions.

1. Brahmagupta’s basket

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