Answer: B) 50 Explanation: Sony and her brother's age sum is 31Let Sony's mother's age be 'x'.Now the conditions given for both of their ages related to their mom is1/5(x-15) + 3/5(x-10) = 31x-15 + 3x-30 = 1554x-45 = 1554x = 200x = 50So, Mother's age = 50. Cross verification : 15 years ago age = 35 => Sony age = 710 years ago age = 40 => bro age = 24 Sum = 24 + 7 = 31.

Answer: B) 70% is better Explanation: Let Price be Rs.100 1st CASE: Then 100 x 70/100 = 70=> price after discount = 100-70 = Rs.30 2nd CASE: Then 100 x 40/100 = 40=> price after discount = 100-40 = Rs.60then60 x 30/100 = 18=> price after 2 consequent discount = 60-18 = Rs.42 =>from 1 and 2 cases, 70% discount is better.

Answer: B) divides a state into separate counties with their own leaders. Explanation: Incorporation is a legal process that enables the formation of a local government and divides a state into separate counties with their own leaders.   The different counties become self governing entities under the laws of the state in which they fall and are given the authority to function as independent units but within the jurisdiction of the state laws.

Answer: D) 120 sq.cm Explanation: The triangle with sides 26 cm, 24 cm and 10 cm is right angled, where the hypotenuse is 26 cm. Area of the triangle =1/2 x base x height => 1/2 x 24 x 10 = 120 sq.cm

Answer: C) Primary Memory Unit Explanation: Memory is the part of the computer that temporarily holds data and instructions before and after they are processed by the ALU.   Memory is also known as primary storage, primary memory, main storage, internal storage, and main memory.   Manufacturers often use the term RAM, which stands for random-access memory.​

Answer: A) Saturday Explanation: We know that, After every 400 years, the same day occurs.Thus, if 9th August 2016 is Saturday, before 400 years i.e., on 9th August 1616 has to be Saturday.

Answer: B) to define and limit government power Explanation: There are many reasons why a constitution is needed. One of the primary purposes is to define and limit power of the government. It gives the structures for the functioning of the country such as courts and parliament and limits the power. e.g. to imprison without trial for the government.

Answer: D) The kidneys deactivate vitamin D and stimulate the activity of osteoclasts Explanation: The kidneys deactivate vitamin D and stimulate the activity of osteoclasts is wrong among the functions of kidneys.   The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart.   The kidneys perform many crucial functions, including: maintaining overall fluid balance. regulating and filtering minerals from the blood. filtering waste materials from food, medications, and toxic substances. creating hormones that help produce red blood cells, promote bone health, and regulate blood pressure.