Jaikishan and Premkishan Solutions for Exercise 1: Let us Practice

Directions: In the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
$4\times 6-2=14$

Directions: In the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
$(6 ÷ 2) \times 3 = 0$

Directions: If the given interchanges are made in signs and numbers, which one of the four equations would be correct?
 Given interchanges: signs '$\times$' and '$÷$', numbers '$4$' and '$9$'.

Directions: If the given interchanges are made in signs and numbers, which one of the four equations would be correct?
Given interchanges: signs '$-$' and '$÷$', numbers '$2$' and '$6$'.

If $16 – 2 = 2, 9 – 3 = 0, 81 – 1 = 8,$ then what is $64 – 4 =?$

Let $J=1, K=2, L=5, M=7, N=11, O=13$ and $P=17$. Find the letter which is inserted in the given box in the relation given.
$(N \times \square + M) ÷ K = 31$

If $+, -, |, ɸ, \times$ and $\square$ stand for greater than, not less than, less than, not greater than, equal to and not equal to respectively, then $x \square y + z$ may be given as:

Directions: In the following question, the symbols $@, \$, \#, \copyright , \%$ are used with the following meanings as illustrated below.
'P $\$$ Q' means ' P is not smaller than Q'.
'P $\copyright$ Q' means 'P is neither greater than nor equal to Q' 
'P $\#$ Q' means 'P is neither smaller than nor equal to Q'
'P $\%$ Q' means 'P is not greater than Q'.
'P $@$ Q' means ' P is neither greater than nor smaller than Q'.
Now, in each of the following questions assuming the given statements to be true, find which of the four conclusions I, II, III and IV given below them is/are definitely true and give your answer accordingly.

Statements: T $\%$ R, R $\$$ M, M $@$ D, D $\copyright$ H
Conclusions:
I. D $\%$ R
II. H $\#$ R
III. T $\copyright$ M
IV. T $\%$ D