29. The ratio of the number of girls to the number of boys in a hall was 2:3. After 10 girls and 10 boys entered the hall, the ratio of the number of girls
to the number of boys became 5:7. How many boys were there in the hall
at first?
22

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics