Questions

The series number is found in both the upper right margin and the lower left margin. It is a sequence reference expressed either as a four-digit numeral (1125) or as a letter, followed by a three- or four-digit numeral (M661, T7110).

Add together values in corresponding positions of the top two crosses, and put the result in the lower left cross.

Calculate the difference between values in corresponding positions of the top two crosses, and put the result in the lower right cross.

Finally add together the values in corresponding positions of the lower two crosses to give the values in the central cross

The International Waste Picker's Day is observed on 1st March in memory of the massacre in Colombia in which 11 workers were brutally killed University of Barranquilla.

The atmospheric pressure at the surface of the Earth is due to gravitational pull of the earth and is about 14.7 psi.

That means that the weight of a column of air which has a cross section of 1 square inch and which stretches from the surface of the Earth to space is 14.7 pounds.