. . .

Relations between different trigonometrical ratios: Trigonometrical ratios of complementary angles: . . .

Question: If 12 men and 16 boys can do a piece of work in 5 days & 13 men and 24 boys can do it in 4 days, how long will 7 men & 10 boys takes to do it? . . .

A gets = 10000; B gets = 5000; C gets = 2500 . . .