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4th &7th term is 20 & 32 , find a ,d & nth

Maya , Madhura and Mhsina are friends studying in the same class. In a class test in geography Maya got 16 out of 25. Madhura got 20. Thier average score is 19. How much did Mohsina score

in a mixture of water and 1/4 is sand.write down the ratio of water to sand

if |vector a+ vector b| = |vector a- vector b|find the angle between a and b

Find simple interest and amount for 850 from 10th March to 3rd August at 5% per anum

A splash is heard 3.12s after a stone is dropped into a well 45m deep.the speed of sound in air is(g=10m/s2)

Round off till nearest perfect square 64.0 63.6 65.1 68.4 70.1 114.4 49.8 50.3 57.3 59.9 61.56 107.8 25.3 26.3 26.1 27.3 28.7 77.4 17.5 18.7 20.6 21.4 22.9 69.1

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