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Calculate the number 997

NUMBERMANIA: Calculate the number 997 using numbers [2, 9, 3, 2, 87, 478] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 16

The first user who solved this task is Djordje Timotijevic.

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Who pushed the forward button on my weekend

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Henry Nicholas Ridley

Born 10 Dec 1855; died 24 Oct 1956 at age 100.English botanist who was largely responsible for establishing the rubber industry in the Malay Peninsula. At the turn of century (1888-1912), as the first Director of the Singapore Botanic Gardens Ridley conducted experiments with Para rubber trees (Hevea brasiliensis) that convinced him of the enormous economic potential of rubber as a plantation crop. After developing a more efficient tapping method, he began a campaign to establish a rubber industry. Despite considerable initial opposition among planters, he persisted, and by 1896 Malaya's planters were convinced, and the first rubber estates were planted using his seeds. Ridley also carried out an extensive study of plants of the Malay Peninsula, especially monocotyledons.

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