Question

The sum of face values of a seven digit number with the same digit is 28. Find the product of the place values at the tens of thousands places of the number

Answer 1

According to question

Let the face values of seven digit number be a, b, c, d, e, f and g

Thus   Number  = a*1000000 + b*100000 + c*10000 + d*1000 + e*100 + f*10 + g

Thus according to question

a + b + c + d + e + f + g = 28

We need to find     d * f = ?
  
d + f = 28 - (a+b+c+e+g)
d = 28 - (a+b+c+e+g) - f
Thus

d *f = [28 - (a+b+c+e+g) - f ] * f
       = 28f - (28 - d - f ) f- f^2
0 = 28f - 28f +f

Answer 2

Answer:

4face value×7 times=28.

4444444=28

Find out product of tens and thousands place value.

4000× 40=16.0000