IPhone eshop
An e-shop employee has lost some sales records and cannot now calculate the ratio by which the number of iPhones sold increased compared to last year. Help him calculate the ratio, knowing that the ratio of the number of iPhones sold and the ratio of the number of tablets sold are proportional to the number of tablets sold, which increased by a ratio of 7:5. The first term of the ratio of iPhones sold is 21.
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