What is British standard 2769?

A product of 20 with a sum of 9? If x plus y equals 12 and y plus z equals 11 and z plus x equals 13 what is the average of x y and z? What is the product of 700 and 2300? What is the definition for absolute difference? What is 10 percent of R1000? What is a word for slope that beggins with g? What is the largest 4-digit ordinal number? How many times does 13 go into 29? Area of cross-section mean? Is y x4 inverse? What is 0.76 as a fraction? What grade is an 65? How do you write decimal number 0.561 in word form? What is the greatest common factor of 64 and 96 and 48? Does a pinwheel have a 45 degree rotational symmetry? What two number equal 29? What does the word poly hedron mean? What is the volume of a cube with a surface area of 54 inches? What does length and width lw represent? How many consecutive shifts can you work?