Which of the following interchanges of signs would make the given equation correct?

1000 - 448 + 14 ÷ 15 × 2 = 998

Which two signs and two numbers should be interchanged in the following equation to make it correct?

15 ÷ 80 - 34 + 10 × 8 = 102

Select the option that is related to the fourth term in the same way as the first term is related to the second term and the fifth term is related to the sixth term.

17 : 4624 :: ? : 180 :: 13 : 2028

Select the set in which the numbers are NOT related in the same way as are the numbers of the following set.

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding/substracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

(5, 13, 16) 

(4, 11, 14)