exam Maths Puzzle Numerical Ability

If one month there is an increase of 50% and the next there is a decrease of 25% how much was the increase or decrease.

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please kindly help me to solve this problem....


{{{ ( 8cube root of x)+ cube root of (64x^4) + cube root of (-27x^7) }}}
simplify:


3 square root b^2 divided by 4 square root b^3


a. 1 over 12 square root b
b. 12 square root b^5
c. 7 square root b^5
d. 12 square root b