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Vinil7 [7]
3 years ago
9

How do you do this?? I don’t understand at all

Mathematics
2 answers:
AlladinOne [14]3 years ago
7 0

X=5 becuase if 7*3=21 then x*3=15 and 5 times 3 = 15



So the answer is 12

Rus_ich [418]3 years ago
4 0

so i believe that 21 shrinks down to 7 and then you find what multiplication can make 7 to 21 and the answer is 3 because of 7*3=21

then  you do the same to the other side which is 15 but instead you divide by 3 which gives you 5 so

x=5

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3 0
3 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
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Answer:

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a*10 + b*1

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We know that:

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then:

a*10 + b*1 + (b*10 + a*1) = 132

And we also know that the digits differ by 2.

then:

a = b + 2

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a =  b - 2

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a*10 + b*1 + (b*10 + a*1) = 132

(a*10 + a) + (b*10 + b) = 132

a*11 + b*11 = 132

(a + b)*11 = 132

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Then:

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And remember that:

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or

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Then if we select the first one, we get:

a + b = 12

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The number is 75.

And if we selected:

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Both are valid solutions because we are changing the order of the digits, so is the same:

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3 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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