Quantitative Aptitude - Arithmetic Ability Questions

If a2+1a2 = 38, then find the value of a-1a?

The ratio of incomes of C and D is 3 : 2. Ratio of income of D and E is 5 : 4. If one-third of C’s income is Rs 4000 more than the half of E’s income, then what is the D’s income (in Rs)?

Find the area (in sq.cm) of a semi-circle of radius 7 cm

What is the simplified value of (cosec A – sin A)(sec A – cos A)(tan A + cot A)?

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

In a camp 180 students had ration for 20 days. How many students should leave the camp if the ration should last for 25 days?

R and S started a business by investing Rs 165000 and Rs 195000 respectively for the same period of time. If R’s share in the profit earned by them is Rs 11000, then what is the total profit (in Rs) earned by both of them together?