If the diameter is 10.5 then the radius is 5.25.
This is because the radius of a diameter is half the diameter.

So

10.5/2
= 5.25

Therefore the radius is 5.25

6 0

2 years ago

In a two-digit number, the tens digit is 5 less than the units digit. The number itself is five more than three times the sum of

Luden [163]

Given:

In a two-digit number, the tens digit is 5 less than the units digit.

The number itself is five more than three times the sum of its digits.

To find:

The number.

Solution:

Let the two digit number is ab. So,

$ab=10a+b$

Tens digit is 5 less than the units digit.

$a=b-5$ ...(i)

The number itself is five more than three times the sum of its digits.

$10a+b=3(a+b)+5$

$10a+b=3a+3b+5$

$10a+b-3a-3b=5$

$7a-2b=5$ ...(ii)

Using (i) and (ii), we get

$7(b-5)-2b=5$

$7b-35-2b=5$

$5b=5+35$

$5b=40$

$b=8$

Putting b=8 in (i), we get

$a=8-5$

$a=3$

Therefore, the required number is 38.

5 0

2 years ago

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