In the following number-pairs, the second number is obtained by applying some mathematical operations on the first number. Select the option in which the numbers are related in the same way as the numbers in the following number-pairs. (Note: Operations should be performed on whole numbers without breaking the numbers into their constituent digits. Take 13 for example. Operations on 13 such as addition/subtraction/multiplying by 13 etc. can be performed only on 13. Breaking 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not permitted.)   50,74 66, 90