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Just Math
Evaluate the missing digit (
Posted on 20180129
)
If the tens digit (second from the right)
of the product p = 2z7 * 39 is 9,
find the digit z.
No Solution Yet
Submitted by
Ady TZIDON
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Solution
Comment 1 of 1
2z7 * 39
= 2z7*9 + 2z7*30
The tens digit of the first product is 9z+6
The tens digit of the second product is 1
So the tens digit of p is the unit digit of 9z+7
9z+7 ends in 9
9z ends in 2
9z = 72
z=8
check:
2
8
7*39 = 111
9
3
Posted by
Jer
on 20180129 09:48:02
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