Three pipes a, b, and c can fill the tank in 10 hours, 20 hours and 40 hours respectively. in the beginning all of them are opened simultaneously. after 2 hours, tap c is closed and a and b are kept running. after the 4th hour, tap b is also closed. the remaining work is done by tap a alone. what is the percentage of the work done by tap a alone?

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

10 points? ? +++ me asap gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a) gabriella averages 7.5 u.s. dollars for every 100 euros. b) gabriella averages 100 u.s. dollars for every 25 euros. c) gabriella can exchange 75 u.s. dollars for 100 euros. d) gabriella can exchange 100 u.s. dollars for 75 euros.