how many 2 digits number leave the reminder 1.when it is divided by 5... OPEN CHALLENGE
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Answer:
18
Step-by-step explanation:
Arguement: Any two digit number can be expressed as 10x+y. So, for it to leave remainder of 1, (10x+y)/5 = 5q + 1
2x + y/5 = 5q + 1
Applying the constraint of x and y each less than 10, for each value of x, y can take the value of either 1 or 6. Since there are 9 values x can take, from 1 through 9 (note how x ≠ 0), there are 18 values y could take. So, there are 18 numbers.
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