If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?
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In what ratio should tea costing Rs 300/kg be mixed with tea costing Rs 200/kg so that the cost of the mixture is Rs 225/kg?
Three consecutive natural numbers are such that the square of the greatest is greater than the product of the other two by 16. The smallest of these numbers is
The third proportional of two numbers 4 and 20 is
An engineering student has to secure 25% marks to pass. He gets 47 and fails by 43 marks. What are the maximum marks of the examination?
The number whose square is equal to the difference of the squares of 37 and 23 is:-
372 – 232 =840 Required number =840 = 28.98
The area of a square is 72.25 cm². Find its perimeter (in cm).
In the given series of numbers how many 7's are there which are immediately followed by 9 and immediately not preceeded by 5 ?
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