Can you fill the blank with the correct number?

6 30 870 756030 _____

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Count the number of triangles in the given picture.

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Which city is three-fifths chick two third cat and 50% goat?

If two's company, and three's a crowd, then whats four and five ?