Quantitative Aptitude - Arithmetic Ability Questions

A student multiplied a number by 6/7 instead of 7/6. What is the percentage error in the calculation?

In an army selection process, the ratio of selected to unselected candidates was 9:2. If 80 less had applied and 20 less selected, the ratio of selected to unselected would have been 5:1. How many candidates had applied for the process?

x and y are two numbers such that their mean proportion is 16 and third proportion is 128. What is the value of x and y?

A,B and C together start a business. Three times the investment of A equals four times the Investment of B and the Capital of B is twice that of C. The ratio of share of each in the profit.

If a2+b2+c2=83and a+b+c=15 then the value of ab+bc+ca is

Find the odd one out among the following.

A Rs 100 shirt is offered at 10% discount and a Rs 300 pair of trousers at 20% discount. If Pritam bought 1 shirt and 3 pairs of trousers, what is the effective discount (in %) he got?

If the amount received at the end of 2nd and 3rd year at Compound Interest on a certain Principal is Rs 1,800, and Rs 1,926 respectively, what is the rate of interest?