If a ladder touches the roof of a wall and makes an angle of 40° with the 15 metre ling wall , then the length of the ladder is-

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Three boys have marbles in the rotio of 19 : 5 : 3 If the boy with the least number has 9 marbles , how many marbles does the boy with the highest number have?

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The area of a rectangle R with width 4 ft is equal to the area of a square S , which has a perimeter of 24 ft. the perimeter of the rectangle R, in feet, is __

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In a class of 120 students 70 percent can speak only Bengali and the rest can speak English . If 25 percent of those in the class who can speak English can also speak Bengali , how many of the students in the class can speak bengali?

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