exam Maths Puzzle Numerical Ability

A bank wants to capitalize on securities it owns by borrowing money from the state using the securities as collateral. The State requires the collateral to be at a rate of 150% fo

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Hello,
I am having a problem with finding the answer to this question.
Please help.
10x-1/4=9x+3/8

Thanks,
Patricia An oil tanker can be emptied by the main pump in 4 hours and by an auxiliary pump in 9 hours. If the main pump is started at 9 a.m., when should the auxiliary pump be started so that the tanker is emptied by noon?