Advertisements
Advertisements
प्रश्न
If 5A × A = 399, then the value of A is ______.
विकल्प
3
6
7
9
Advertisements
उत्तर
If 5A × A = 399, then the value of A is 7.
Explanation:
We have, 5A × A = 399
Here, A × A = 9 i.e. A × A is the number 9 or a number whose unit’s digit is 9.
Thus, the number whose product with itself produces a two-digit number having its unit’s digit as 9 is 7.
i.e. A × A = 49 ⇒ A = 7
Now, 5 × A + 4 = 39
⇒ 5 × 7 + 4 = 39
So, A satisfies the product.
Hence, the value of A is 7.
APPEARS IN
संबंधित प्रश्न
Find the quotient when the difference of 985 and 958 is divided by 9.
If \[\overline{{3x2}}\] is a multiple of 11, where x is a digit, what is the value of x?
Given an example of a number which is divisible by both 4 and 8 but not by 32.
Use the same rule to fill the hexagons below.
Now you also make your own magic hexagons.
Now you try and change these numbers into special numbers —
132
The difference of three-digit number and the number obtained by putting the digits in reverse order is always divisible by 9 and ______.
A four-digit number abcd is divisible by 11, if d + b = ______ or ______.
A number is divisible by 11 if the differences between the sum of digits at its odd places and that of digits at the even places is either 0 or divisible by ______.
If a number a is divisible by b, then it must be divisible by each factor of b.
If 148101B095 is divisible by 33, find the value of B.
