A lump of two metals weighing 18 g is worth Rs. 87. If their weights be interchanged, it would be worth Rs. 78.60. If the price of one metal is Rs. 6.70 per gram, find the weight of the other metal in the mixture.

A tea trader mixed two varieties of tea, one costing Rs. 3.50 per kilogram, and the costing Rs. 4 per kilogram, and sells 40 kg of the mixture to a vendor at Rs. 4.50 per kilogram, and makes a profit of 20%. How much of each variety did the vendor mix?

In a factory men, women and children were employed in the ratio 8 : 5 : 1 to finish a job and their individual wages were in the ratio 5 : 2 : 3. When 20 women were employed, total daily wages of all amounted to Rs. 318. Find the total daily wages paid to each category.