Answers Week 7

Logical 13 - Assertion and Reason

Assertion - In medical parlance with respect to blood groups, a person with a blood group of ‘O’ is called Universal Donor.

Reason - A person with the ‘AB’ blood group can accept blood of all types, i.e., A, B, AB and O.

Both A and R are true, but R is not the reason for A.
Hence, option (b) is correct.

Logical 14 - Mathematical Operations

If ‘*’ indicates either ‘+’ or ‘*’, solve the following questions.

What is the maximum value of

1*2*3*4*5*6*7

(a) 5040 

(b) 5041

(c) 7!/2 

(d) none of these

The maximum value will be obtained when we use multiplication between 2 to 7 and addition between 1 and 2.
1 + 2 * 3 * 4 * 5 * 6 * 7 = 5041
Hence, the answer is (b).

What is the minimum value of

1*2*3*4

(a) 10 

(b) 9

(c) 11 

(d) 14

The minimum value will be got if we use a multiplication between 1 and 2 and addition between 2, 3, and 4.
The value will be 1 * 2 + 3 + 4 = 9.
Hence, the answer is (b).


Quants  14 - Alligation

Two vessels A and B contain spirit and water mixed in the ratio 5 : 2 and 7 : 6 respectively. Find the ratio in which these mixtures be mixed to get a new mixture in vessel C containing spirit and water in the ratio 8 : 5?

Let the CP of Spirit be Re. 1.
Spirit in 1 litre mixture of A = 5 / ( 5 + 2 ) = 5 / 7 = Re . 5 / 7
Spirit in 1 litre mixture of B = 7 / 13 = Re . 7 / 13

Spirit in 1 litre mixture of C = 8 / 13 = Re . 8 / 13

Required Ratio = 1/13 : 9/91 = 7/91 : 9/91 = 7 : 9