For the following questions answer them individually
Marbles of diameter 1.4 cm are dropped into a cylindrical beaker containing some water and are fully submerged. The dia meter of the beaker is 7 cm. Find how many marbles have been dropped in it if the water rises by 5.6 cm.
Water is flowing at the rate of 3 km/hr through a circular pipe of 20 cm internal diameter into a circular cistern of diameter 10m and depth 2m. In how much time will the cistern be filled ?
A bicycle wheel makes 5000 revolutions in moving 11 km. The diameter of the wheel, in cm, is
At each corner of a triangular field of sides 26 m. 28 m and 30 m, a cow is tethered by a rope of, length 7 m. The area (in m ) ungrazed by the cows is
A shopkeeper allows 23% commission on his advertised price and still makes a profit of 10%. If he gains 56 on one item, his advertised price of the item is
An alloy contains copper, zinc and nickel in the ratio of 5 : 3 : 2. The quantity of nickel in kg that must be added to 100 kg of this alloy to have the new ratio 5 : 3 : 3 is
The ratio of the ages of Ram and Rahim 10 years ago was 1 : 3. The ratio of their ages five years hence will be 2 : 3. Then the ratio of their present ages is
The incomes of A, Band C are in the ratio 7 : 9 : 12 and their spendings are in the ratio 8 : 9 : 15. If A saves 1/4 th of his income, then the savings of A, B and C are in the ratio of
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