Company: Qualcomm
Difficulty: medium
A chemist has two solutions of acid—one containing 30% acid and another containing 50% acid. How many liters of each solution should be mixed to obtain 40 liters of a 40% acid solution? 25 & 15 liters respectively 20 & 20 liters respectively 10 & 30 liters respectively 30 & 10 liters respectively B is standing at point (0, 0). A is standing 12 km West of B. A walks 7 km North and then 5 km East. B walks 3 km South and then 9 km West. After these movements, what is the distance and direction of A from B? 10 km, North-East √116 km, North-East 10√5 km, North-East 2√26 km, North-East The ratio of the ages of three siblings A, B, and C is 4:5:6. If the difference between the age of the eldest and youngest is 10 years, then what is the sum of their ages? 65 years 80 years 70 years 75 years In the given figure, radii of two circles with centres S and T respectively are in the ratio 5 : 3 and PT = 12 cm. If R and Q are points of contact of the tangent drawn from P to the circle