By interchanging the given two signs, which of the following equations will NOT be correct?
 × and –
 I. 17 – 21 + 86 ÷ 2 × 13 = 387
 II. 10 + 63 – 12 × 259 ÷ 7 = 739

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
58 × 12 = 4, 37 × 96 = 5, 11 × 20 = 2, 42 × 12 = ? 

Find out the related number to complete the equation. If 175 = 42 and 325 = 16, 485 is equivalent to what?

In each of the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
( 3÷4 ) + 2=2 

Which of the following signs of equation are to be interchanged which will make the given equation correct?

5 + 6 ÷ 3 – 12 × 2 = 17

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
33 * 11 * 3 * 6 = 115 

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
7– 4 – 1 = 714, 9 – 2 – 3 = 932 8– 0–4 = ?  

Select the option in which the numbers do NOT share the same relationship as that shared by the given pair of numbers.
(98, 107, 125)