Quantitative Aptitude - Arithmetic Ability Questions

When Vijay sells 12 pens, he gains the selling price of 2 pens. Calculate his % profit?

ΔABC is right angled at B. BD is an altitude. AD = 3 cm and DC = 9 cm. What is the value of AB (in cm)?

The area of a triangle ABC is 63 sq.units. Two parallel lines DE, FG, are drawn such that they divide the line segments AB and AC into three equal parts. What is the area of the quadrilateral DEGF?

Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

P, Q and R are channels which discharge solutions A,B and C respectively in a tank. When the tank is empty and all the three channels are opened what is the proportion of the solution C in the tank after 3 minutes, if the channels P, Q and R can fill the tank from empty to full in 30 minutes and 20 minutes and 10 minutes respectively when they are opened one at a time.

The slope of the line passing through the points (-5,1) and (x,-4) is -5/8. Find x.

What is the reflection of the point (-1 , 3) in the line x = -4?

Select the odd number from the given alternatives.