exam Maths Puzzle Numerical Ability

1.3x+2.8x=12.3

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exam Other Question

multiply, multiple choice:

-3a^2b 14a^3b^2
------ * ---------
35a^5 -9b^4

Answers:
a)9/6

B)2b/15

C)9/15

D)2/15b

I am very confused on this pro ravish sold his motor cycle to vineet at a loss of 28% vineet spent rs. 1680/-on its repair and sold the motor cycle to rahul for rs. 35910, thereby making a profit of 12.5% find the cost price of the motor cycle for ravish.