Quantitative Aptitude - Arithmetic Ability Questions

A does 50% of a work in 12 days. He then calls in B and they together finish the remaining work in 8 days. How long B alone would take to complete the whole work?

In what ratio should coffee powder costing Rs 2500/kg be mixed with coffee powder costing Rs 1500/kg so that the cost of the mixture is Rs 2250/kg?

If the present ages of a father and his son are 48 years and 28.8 years old respectively, then the father can say to his son, "I was ......... of your present age when you were born".

Rs. 750 invested for 3 months gave an interest of Rs. 18. What was the simple rate of interest per annum?

The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area?

A train, 200 m long, is running at a speed of 54 km/hr. The time in seconds that will be taken by train to cross a 175 m long bridge is

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

In a Rhombus ABCD, measure of angle CAB is 35°, what is the measure of angle ABC?