Population of japan as of 2009 was about 127,000,000 (127 million). what percent of the world’s population is this?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?

How many ordered pairs of positive integers satisfy xy=32?