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since cat 2020 was conducted for 2 hours, why aren't the mocks as per that time duration? What is the point of taking it for 3 hours now?

The ratio of time taken by A and B together to B alone to do a piece of work is 3:5 . what is the ratio of A's efficiency to A's and B's together efficiency

there are two positive numbers.Each was increased by 30 and then by same percentage as it was increased the first time . after the second increase the value of each no. is 147 . find the difference between the two numbers.

How to find number of integral solutions of equation:
a + b + c + d = 30
given that 0<=(a,b,c)<=15 ?

Sudhir has coins of the denomination of. 1, 50 p and 25 p in the ratio of 12:10:7. The total worth of the coins he has is 112.5. Find the number of 25 P coins that Sudhir has

(a) 48

(c) 60

(b) 72

(d) 42

Sudhir has coins of the denomination of. 1, 50 p and 25 p in the ratio of 12:10:7. The total worth of the coins he has is 112.5. Find the number of 25 P coins that Sudhir has

(a) 48

(c) 60

(b) 72

(d) 42

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`यदि x^(2 +x=19 तो (x+5^(2 + (1 /(x+5^(2 का मान क्या होगा? (a) 77 (b) 79 (c) 81 (d) 83`