John has us and foreign stamps in his album. the ratio of the number of us stamps to foreign stamps is 5:2. after paul gives him 12 foreign stamps, the ratio becomes 2:1. find the number of us stamps he has.

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.