exam Maths Puzzle Numerical Ability

x-0.04(x-10)=96.4

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exam Other Question

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 Add or subtract as indicated
b+b-1

2b+b^2-1

a-1+a+1

a+1+a-1

4-a-5

1-5-a