TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: What is reduced by playback equipment?, Context: Due to recording mastering and manufacturing limitations, both high and low frequencies were removed from the first recorded signals by various formulae. With low frequencies, the stylus must swing a long way from side to side, requiring the groove to be wide, taking up more space and limiting the playing time of the record. At high frequencies, hiss, pops, and ticks are significant. These problems can be reduced by using equalization to an agreed standard. During recording the amplitude of low frequencies is reduced, thus reducing the groove width required, and the amplitude at high frequencies is increased. The playback equipment boosts bass and cuts treble so as to restore the tonal balance in the original signal; this also reduces the high frequency noise. Thus more music will fit on the record, and noise is reduced.

SOLUTION: treble

PROBLEM: On what planet are the countries that import Guinea-Bissau's exports located?, Context: Guinea-Bissau's GDP per capita is one of the lowest in the world, and its Human Development Index is one of the lowest on earth. More than two-thirds of the population lives below the poverty line. The economy depends mainly on agriculture; fish, cashew nuts and ground nuts are its major exports.

SOLUTION: earth

PROBLEM: One of the most successful agricultural production region is located where?, Context: Tea, coffee, sisal, pyrethrum, corn, and wheat are grown in the fertile highlands, one of the most successful agricultural production regions in Africa. Livestock predominates in the semi-arid savanna to the north and east. Coconuts, pineapples, cashew nuts, cotton, sugarcane, sisal, and corn are grown in the lower-lying areas. Unfortunately, the country has not attained the level of investment and efficiency in agriculture that can guarantee food security and coupled with resulting poverty (53% of the population lives below the poverty line), a significant portion of the population regularly starves and is heavily dependent on food aid. Poor roads, an inadequate railway network, under-used water transport and expensive air transport have isolated mostly arid and semi-arid areas and farmers in other regions often leave food to rot in the fields because they cannot access markets. This was last seen in August and September 2011 prompting the Kenyans for Kenya initiative by the Red Cross.

SOLUTION:
Africa