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A base-10 integer n = 4d_9 = d0_7, where d represents a single digit. What is the value of n?

 Jul 30, 2021
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d + 4 *9   =  0 + d *7

d + 36 = 7d

d = 6     so n = 42 10

 Jul 30, 2021
edited by ElectricPavlov  Jul 30, 2021

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