The detection limit of XRF is（/wb）：

Abag contains purple marbles and red marbles, 114 in total. the number of purplemarbles is 6 more than 5 times the number of red marbles. how many purplemarbles are there?

Rescooperate ice cream shop recently analyzed their books. they found that in the past year, they made 100000 selling ice cream and spent 75000 on supplies and factory space. the remaining 25000 represents

Most tornadoes carry winds speeds in a range of km per hour