Quantitative Aptitude - Arithmetic Ability Questions

A's income is Rs 140 more than B's income and C's income is Rs 80 more than D's. If the ratio of A's and C's income is 2:3 and the ratio of B's and D's income is 1:2, then the incomes of A, B, C and D are respectively

The sum of twice a number and thrice its reciprocal is 25/2. What is the number?

A can do a work in 36 days and B in 12 days. If they work on it together, then in how many days will they be able to do the work?

What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2]?

What is the value of [12/(√5 + √3)] + [18/(√5 – √3)]?

5% discount is offered on an item. By applying a promo code the customer wins 20% cash back. What is the effective discount?

18 buckets of water fill a tank when the capacity of each bucket is 8 litres. How many buckets will be needed to fill the same tank, if the capacity of the bucket is 12 litres?

In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?