Number System
In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient?

20
13
0
12

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Number System
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

69
Cannot be determined
96
78

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