Book Maths Puzzle Numerical Ability

2*9=306,
4*8=?

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Book Other Question

A steamer can travel at 9 km/hr upstream and at 12 km/h downstream.at what speed is the stream running. i was shopping for vegetables at the new market . I saw two pumpkins of same quality but of different sizes. The bigger one was 60cm in circumference and the other 50cm. the vendor says that price of the bigger one was 1.5 times more expensive.
which one do you think would have been a better buy.