exam Maths Puzzle Numerical Ability

if it takes the faucet 21 minutes to fill the tub, and it takes the drain 28 minutes to empty the tub, how long will it take to fill the tub, if grandma forgets to close the drain while filling it?

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exam Other Question
given:
<rst= 50
<tsv=40
<X is a right angle
Prove:<rsv is congruent to <x Find the coordinates of the x and y intercepts. x + 2y = 4