What is the greatest possible length of a scale that can be used to measure exactly the lengths 3 m, 5m , 10 m and 12 m 90m,
A. 30 cm
B. 20 cm
C. 10 cm
D. None of these
The average of 7 consecutive numbers is 20. the largest of these numbers is.
A. 22
B. 23
C. 24
D. None of these
If the arithmetic mean of 6 numbers is 45, what is the total sum of these numbers.
A. 27
B. 45
C. 65
D. None of these
In 1 kg mixture of sand and iron, 20% is iron. How much sand should be added so that proportion of iron become 10%.
A. 1 kg
B. 200 gm
C. 500 gm
D. None of these
In an examination, 65% of the total examinees passed. If the number of failure is 420, the total number of examinees is.
A. 500
B. 1000
C. 1200
D. None of these