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Nata [24]
3 years ago
15

A 2 digit number is 5 times its units digit. the sum of the digits is 7. find the number

Mathematics
1 answer:
astraxan [27]3 years ago
6 0
X - tens digit
y - units digit

10x+y=5y\\
x+y=7\\\\
10x=4y\\
x=7-y\\\\
10(7-y)=4y\\
70-10y=4y\\
14y=70\\
y=5\\\\
x=7-5\\
x=2\\\\
10\cdot2+5=\boxed{25}
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