book Maths Puzzle Numerical Ability

Solution A is 8% acid and Solution B is 4% acid. If a technician wants to mix them to make 150 liters of Solution C which is 6% acid, how many liters of each should be mixed together?
thanks for the help!

Read Solution (Total 0)

book Other Question
A triangle can be formed having side lengths 4,5,& 8. It is impossible, however, to construct a triangle with sidelengths 4,5 & 10. Using the side lengths 2,3,5,7 & 11, howmany different triangles with exactly 2 equal sides can be formed? ok i have done 21 of these and here are the ones i cant get...

Use log9^7=0.8856 and log9^4=0.6309 to evaluate each expression

log9^28
log9^49
log9^144
log9^15.75