What approximate value should come in the place of question mark (?) in the following question?

11.92 + 3(-2.18 × 2.97) - (17.98 ÷ 5.96) = ?

The area of the triangle whose vertices are given by the coordinates (1, 2), (-4, -3) and (4, 1) is:

Direction: Study the information given below carefully and answer the questions given below.
Three companies A, B and C manufactured two types of bottles viz Steel and Copper. Total number of bottles manufactured by the company is 1000. The ratio between the number of copper bottles manufactured by A and the number of Steel bottles manufactured by B is 13: 17. The total number of Copper bottles manufactured by C is 164. The number of Copper bottles manufactured by B is 25 more than the same type of bottles manufactured by A. The 14.28 % of the number of Copper bottles manufactured by B is equal to the 1/9th of the total number of Steel bottles manufactured by C. The number of Steel bottles manufactured by A is 122 which is 21 less than the number of Copper bottles manufactured by the same company.

If the cost price of each copper bottles sold by shop B is Rs. 250 and the cost price of steel bottles is 20% more than the copper bottles, then find the total amount earned on selling bottles by shop B.

The sum of the two - digit number is 6 and the number and its flip (digits written in reverse order) both are multiples of 3. If the difference between them is 36, then which of the following is the required number and its flip? 

A takes 2 hours more than B to cover a distance of 40 km. If A doubles his speed, he takes $$1{1\over 2} $$ hours more than B to cover 80 km. To cover a distance of 90 km, how much time will B take travelling at his same speed?

The bus fare between two cities is increased in the ratio 5:11. Find the increase in the fare, if the original fare is Rs. 275.

When positive numbers x, y and z are divided by 31, the remainders are 17, 24 and 27, respectively. When (4x-2y+32) is divided by 31, the remainder will be:

A person invests a certain amount on simple interest. After 8 years he gets 16% interest. If he invests the same sum for 4 years, then he gets Rs. 9600 as interest, then the sum is