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81.The ratio between the radii of two spheres is 1:3. Find the ratio between their volumes?
82.The ratio between the sale price and the cost price of an article is 7:5. What is the ratio between the profit and the cost price of that article?
83.The ratio in which the price at Rs.7.20 a kg be mixed with rice at Rs. 5.70 a kg to produce a mixture worth Rs.6.30 a kg is____?
84.The ratio of boys and girls in a class was 11:13. 8 girls and 4 boys join the class from this academic year and the ratio becomes 4:5. Find the strength of the class.
85.The ratio of investments of two partners P and Q is 7:5 and the ratio of their profits is 7:10. If P invested the money for 5 months, find for how much time did Q invest the money?
86.The ratio of numbers is 3:4 and their H.C.F is 4. Their L.C.M is____?
87.The ratio of the area of a square to that of the square drawn on its diagonal is?
88.The ratio of the area of a square to that of the square drawn on its diagonal is____?
89.The ratio of the cost price and the selling price is 4:5. The profit percent is:____?
90.The Ratio of the length and breadth of a plot is 3:2 .If the breadth is 40m less than the what is the parameter of the plot?