## Answers

How can you explain the difference between 120-70 using mental math.

XXXX

axx(2a)

a(b-a)b(2a)

and 2a=b-1

so a cannot be 1 as that would make the hundreds digit the same as the ones

if a is 2, then 2a=4, and b=5, and the thousands digit is also4.

if a is 3, then 2a=6, and b=7, and thousands is 4 (7-3)

number is 3476

lets see if there are others.

if a is 4, 2a is 8, and b=9, and b-a is 5: solution 4598

a cannot be greater than 4, as the ones digit has to be twice a.

SO, two solutions: 3476 and 4598

check all this..

What is the value of the underline digit 6.... 4,600,028.

What is the fist anwer..

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