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I give CGL 2018 13 junte 3rd shift test and successfully submit ... Now how i get my score please clear my doubt

The marks obtained by Alan in Mathematics, Eng lish and Biology are respectively 90 out of 100, 70 out of 150 and 150 out of 200. Find his average score in percent

(a) 87.83 (c) 76.33

(b) 68.88 (d) 77.33

The answer given is (90+70+150)/(100+150+200)=68.88%
Why can't the answer be (90/100+70/150+150/200)/3=70.05 %

Please give me the easy tricks for quantatitive

27 ,32, 39
17 ,19, 24
38 ,47, 51
300, 376, ?

can I learn in hindi

In the triangle PQR, S is the midpoint of QR. X
is any point on PR. T is the point on QR such
that PT||SX. If the area of triangle PQR is
6.4sq. cm, then the area of triangle RTX is

sir maine abhi abhi ssc cgl ki tayari krna start kiya hu to aage kaise karu kuch strategy bta do sir

If bome is written by 1041 then lion is?

stenographer ka exam wala questions nhi hai isme or opinions v nhi hai !!
help.

A mixture of 40 litres of milk & water contains 10% water. How much water should be added to it to increase water to 25%.