Two-digit number

In a two-digit number, the number of tens is three greater than the number of units. If we multiply the original number by a number written in the same digits, but in reverse order, we get product 3 478. Find the original number.

Correct answer:

x =  74

Step-by-step explanation:

 a=3+b (10 a+b)   (10 b+a) = 3478  3478 = 2 × 37 × 47  47   74 = 3478  x=74

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