book Maths Puzzle Numerical Ability

A 55-gallon barrel contains a mixture with a concentration of 40%. How much of this mixture must be withdrawn and replaced by 100% concentrate to bring the mixture up to 75% concen

Read Solution (Total 0)

book Other Question

A fisherman takes his boat out to sea and then back to the harbor. The entire trip lasts 8 hours. If he travels out at 18 mph and follows the same route back at 14 mph, how many miles does he travel altogether? I NEED HELP SOLVING THIS:
(4X + 3W^2)(4X - 3X^2)