Quantitative Aptitude - Arithmetic Ability Questions

ax + 3y = 6 has slope -2/3. What is the value of a?

Select the odd word/letters/number/number pair from the given alternatives.

A car covers the first 30 km at a speed of 60 kmph and the next 20 km at 80 kmph. Find the average speed.

A can make a cupboard in 10 days and B can do it in 50 days. Along with C, they did the job in 6.25 days only. Then in how many days C alone can do the job?

In a mixture of 25 litres, the ratio of milk to water is 4:1. Another 3 litres of water is added to the mixture. The ratio of milk to water in the new mixture is

A sum of money becomes 77/50 of itself in 18/5 years when invested at simple interest. What is the rate (in percentage) of interest per annum?

The smallest number, which should be added to 756896 so as to obtain a multiple of 11, is

The sum of thrice a number and twice its reciprocal is 97/4. What is the number?