exam Maths Puzzle Numerical Ability

The probability of an event is defined as the ratio of the number of ways the event can occur to the number of all possible outcomes. In getting a card from a deck of 52 cards, wha

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Find the x- and y-intercepts of 7x – 2y = –5

I think I suppose to solve this equation using the substitution method....
Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get there than to return. How fast will her boat go in still water?