Quantitative Aptitude - Arithmetic Ability Questions

Solution A contains 10% acid and solution B contains 30% acid. In what ratio should solution A be mixed with Solution B to obtain a mixture with 25% acid?

The average of 12 numbers is 35. If four numbers 20, 27, 15 and 29 are removed then what will be the average of remaining numbers?

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

What is the sum of a3+b3+c3-3abc, when the value of a=4, b=2 and c=-6?

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

53.01 - 345.02 ÷ 22.99 = 2 ×(?)

What is the simplified value of Sec ACot A + Tan A2 ?

The length of the diagonal and the breadth of a rectangle are 25 cm and 7 cm respectively. Find its perimeter (in cm).

If cot A = n/(n + 1) and cot B = 1/(2n + 1), then what is the value of cot (A + B)?