Keith want to create a drink that is 40% juice. how much of a 10% juice solution should he add to 100 milliliters of 100% grape juice to obtain the 40% mixture?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?