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rusak2 [61]
3 years ago
10

A two digit number is such that the product of the digit is 35 when 18 is added to the number the digits change their places . F

ind the number
Mathematics
1 answer:
Digiron [165]3 years ago
6 0
Consider the number xy where:

xy = 10 . x + y

x . y = 35

xy + 18 = yx

10.x + y + 18 = 10.y + x

10.x - x = 10.y - y - 18

9.x = 9.y - 18

x = y - 2

(y - 2) . y = 35

y^2 - 2y - 35 = 0

Using the Bhaskara formula:

y = 7 (the negative solution is discarded)

x = 7 - 2

x = 5

Response: the xy number is 57.

;-)
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Step-by-step explanation:

Let 7.1239 is a decimal number. Now, we have to round the given decimal number to its nearest thousandth.

Step 1: Identity the thousandth digit. (Here, 3 is the digit which is in thousandth place)

Step 2: Now, look at the digit, which is next to the thousandth place. If that digit is less than 5, round down the thousandth digit. If that digit is greater than or equal to 5, round up the thousandth digit. From the example given above, the digit next to the thousandth digit (i.e., 9) is greater than 5, so we have to round up the thousandth digit.

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Step-by-step explanation:

Given,

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