exam Maths Puzzle Numerical Ability

-20 - (-1)
____________
-3 - (-3)
Help please, I believe this is Undefined but want to double check! Thanks so much for your help.

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exam Other Question

a totalk of $10,000 is invested in two funds paying 5% and 7% annual interest. the combined annual interest is $644. how much of the 10,000 is invested in each fund? if 6x-7=29, then6x=36