6 is just after of 5 and 5 is just before of 6. What is the product of just after and just before of 10?
Answer

The sum of the ages of three boys is equal to the sum of the ages of three girls, and the product of the boys’ ages is equal to the product of the girls’ ages, too. All six children are of different ages, and all are under 20. Suppose that their ages are integers, and the age of the second oldest boy is 14, what is the age of the second oldest girl?

The sum of A and B is 598. The sum of B and C is 374. The sum of C and D is 300. Find the sum of A and D. Answer: The sum of A and D is

Using each of the digits 2, 3, 5 and 6 exactly once, form two 2 – digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers ?

Using each of the digits 2, 3, 5 and 6 exactly once, form two 2 – digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers

What is the product of 4.03 and 2.5? 
Answer: ...........

1.Peter, Bob and Jack do a work. If they work in pairs: Peter and Bob can complete it in 12 hours; Bob and Jack can complete it in 10 hours; Jack and Peter can complete it in 15 hours. Peter needs ........ hours to complete this work by himself.

2.The product of 2 natural numbers is 2015. Find the smallest possible sum of these two numbers?
Answer: The smallest possible sum of these numbers is ...............

Using each of the digits 3, 4, 5 and 6 exactly once to form two 2 - digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers?

u 5:
What is the smallest even number such that it is the product of 9 and a number?
Answer: