exam
Maths Puzzle
Numerical Ability
solve: 3x/7 - 5x/3 = 2/21
21(3x/7) - 21(5x/3) = 21 (2/21)
9x - 35x = 21
- x = 21
-x/26 = 21/-1
x= =21/26
This answers is not correct; please help.
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Could you please help me with this problem. Thank you in advance.
On an algebra test 39 more pupils passed than failed. On a new test,
7 who had passed the first test fai
Pr=1.4pm*3.14d^2/4
Pe=3.14^2/2*EJ/L^2
J=3.14d^4/64
If pm=4, E=2.07*10^5 and L=10 find the value of "d" so that:
Pe=2Pr