Maths quiz 2

1. A number divided by 10 gives the remainder 7. what is the remainder if this number is divided by 5 ?
2. The sum of four numbers in an arithmetic progression is 50 and the third term is 15. What is the first number ?
3. The sum of three numbers is equal to its product. What are the numbers ?
4. The sum of two numbers is 7 and its difference is 1. What is the product of them ? 
   
   
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