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Recent questions tagged mental exercise
+1
vote
1
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If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem
asked
Mar 29, 2019
by
kratos
class-8
playing with numbers
mental exercise
+2
votes
1
answer
For which values of k does f (x, y) = x^2 + kxy + 4y2 have a local minimum at (0, 0)?
asked
Mar 26, 2019
in
Class 12
by
kratos
neet
mental exercise
cbse
class-8
equilibrium
class-12
+3
votes
1
answer
If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?
asked
Oct 28, 2018
by
kratos
class-8
playing with numbers
mental exercise
+1
vote
1
answer
If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem. Why is this so?
asked
Mar 22, 2018
by
kratos
class-8
playing with numbers
mental exercise
+2
votes
1
answer
If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?
asked
Jan 20, 2018
by
kratos
class-8
playing with numbers
mental exercise
+2
votes
1
answer
This tower, located in Italy, has 294 steps inside it.
asked
Jan 19, 2018
by
kratos
ratio and proportion
mental exercise
class-8
cubes and cube roots
know the numbers
class-6
direct and inverse variations
+2
votes
1
answer
Find the largest positive integer that will divide 397, 435 and 541 leaving remainders 6, 10 and 14 respectively.
asked
Jan 2, 2018
in
Class 10
by
kratos
class-8
class-10
real numbers
mental exercise
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