a maths question. think you're up to the challenge?

1 ⤊

a maths question. think you're up to the challenge?

We will call a number N green if 6 x N contains none of the digits 0,1,2,3 and 4. There are two digits such that every green number contains at least one of them. One of these two digits is 1. What is the other?

2007-06-24 00:33:11 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

2 answers

Well, since 98 is a green number (6 x 98 = 588), the other digit has to be either 8 or 9. But 93 is also a green number, since 6 x 93 = 558 ==> the other digit is 9.
Regards
Tonio

2007-06-24 08:46:05 · answer #1 · answered by Bertrando 4 · 1⤊ 0⤋

The answer is 9.

Proof:
93*6 = 558
96*6 = 576
.

2007-06-24 00:51:26 · answer #2 · answered by tsr21 6 · 0⤊ 1⤋