Question

If 3×7 is exactly divided by 3 then the least value of x is

Answer 1

Answer:

3*7 =21

Step-by-step explanation:

21/3

simplified =7

Answer 2

Answer:

2

Solution:

★ Divisibility rule for 3 : If the sum of all the digits of a number is divisible by 3 , then the number itself will be divisibile by 3 .

Here,

We need to replace ★ by the least value in 3★7 so that it becomes exactly divisibile by 3 .

Now,

Sum of digits = 3 + ★ + 7 = 10 + ★

Also,

The number just greater than 10 which is divisibile by 3 is 12 .

Thus ,

The sum of all the digits of the number must be equal to 12 .

Thus,

=> 10 + ★ = 12

=> ★ = 12 - 10

=> ★ = 2

Hence,

The required answer is 2 .