Problem: Over the years the city has been home to people of various ethnicities, resulting in a range of different traditions and cultural practices. In one decade, the population increased from 427,045 in 1991 to 671,805 in 2001. The population was projected to reach 915,071 in 2011 and 1,319,597 by 2021. To keep up this population growth, the KMC-controlled area of has expanded to in 2001. With this new area, the population density which was 85 in 1991 is still 85 in 2001; it is likely to jump to 111 in 2011 and 161 in 2021.
Answer this question based on the article: Which two years had the same population density?
A: 85 in 1991

Problem: Coming off their home win over the Chiefs, the Jets flew to Ralph Wilson Stadium for a Week 9 AFC East duel with the Buffalo Bills. In the first quarter, New York took flight early as kicker Jay Feely getting a 37-yard field goal. The Bills answered with QB Trent Edwards completing a 9-yard TD pass to TE Derek Fine. Afterwards, the Jets regained the lead as Feely got a 26-yard field goal, along with safety Abram Elam returning an interception 92 yards for a touchdown. After a scoreless second quarter, New York kicked off the third quarter with Feely making a 20-yard field goal. Buffalo would respond with kicker Rian Lindell getting a 53-yard field goal, yet New York replied with RB Thomas Jones getting a 7-yard TD run. In the fourth quarter, the Bills tried to rally as CB Jabari Greer returned QB Brett Favre's 300th career interception 42 yards for a touchdown. Favre subsequently led the Jets downfield on a seven-minute drive, resulting in a 31-yard field goal from Feely to put the game out of reach for Buffalo. With the win, not only did New York improve to 5-3, but Favre also earned his first win at Ralph Wilson Stadium after going 0-3 in his previous three visits with Green Bay.
Answer this question based on the article: how many yards did feely get?
A: 37

Problem: Oldsmobile also introduced a 5.7L (350 cu-in, V8) Oldsmobile Diesel engine option on its Custom Cruiser, Delta 88 and 98 models in 1978 and a smaller 4.3L (260 cu-in, V8) displacement diesel on the 1979 Cutlass Salon and Cutlass Supreme/Cutlass Calais models. These were largely based on their gasoline engines but with heavier duty cast blocks, re-designed heads, fast glow plugs, and on the 5.7L, oversized cranks, main bearings, and wrist pins. There were several problems with these engines, including water and corrosion in the injectors (no water separator in the fuel line), paraffin clogging of fuel lines and filters in cold weather, reduced lubrication in the heads due to undersized oil galleys, head bolt failures, and the use of aluminum rockers and stanchions in the 4.3L V8 engines. While the 5.7L was also offered on various Buick, Cadillac, Chevrolet, GMC, and Pontiac models, it was eventually discontinued by all divisions in 1985. 4.3L V6 diesels were also offered between 1982 and 1985.
Answer this question based on the article: What problems did the engines have?
A:
water and corrosion