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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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do you have a method/tip to find quickly that 504 is a multiples of 7 and that 510 is a multiple of 17?

DNS96
Arrived at option C by logic. From option C we know that Kunal is definitely getting $486 in returns. 486 is a multiple of 9.

Quote:
Anil, Sunil and Kunal invested $5600 for 3 months, $3400 for 5 months, $8100 for 2 months

Below can be further evaluated:

Quote:
$5600 is a multiple of 7 | $3400 is a multiple of 17 | $8100 is a multiple of 9

And can be corroborated with available options:

(C) 504 (multiple of 7) , 510 (multiple of 17), 486 (multiple of 9)
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