exam Maths Puzzle Numerical Ability

given: triangle AFE is congruent to triangle BFC

prove: triangle DEF is congruent to DCF
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exam Other Question

2 pumps-
1 fills a tank in 5 hours
1 fills a tank in 7 hours--
how many hours to fill the tank with both pumps filling it at the same time?
how did you come up with the answer?
thanks... WHAT ARE ALL THE DIFFERENT 4 DIGIT COMBINATIONS THAT CAN BE MADE FROM THE NUMBERS 1-9 ?