Quantitative Aptitude - Arithmetic Ability Questions

If l + m + n = 9 and l2+m2+n2 = 31, then the value of lm + mn + nl will be

A boat moves down stream at the rate of 8km/hr. and upstream at 4Km/hr. The speed of the boat in still waters is:

A bag has Rs.51.25 in the form of 2-rupee, 50-paise and 25-paise coins in the ratio of 3:5:7. What is the total number of 50-paise coins?

The mode and median of the data 8, 6, 8, 7, 8, 6, 8, 7, 6 is

The difference between the selling prices of an article sold at 4% and 3% profits is Rs.3 The cost price of the article is :

The simple interest on Rs. 2000 for 2 years at Rs. 75 per thousand per annum will be

HCF and LCM of two numbers are 11 and 825 respectively. If one number is 275 find the other number.

Working together A and B can do a job in 40 days, B and C in 36 days and all three together in 24 days. In how many days can B alone do the job?