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Step-by-step explanation:

7a + 7c = 861 ...... (1)

7a + 5c = 829 ..... (2)

(1) - (2)

2c = 32

c = 16

a = 123 - 16 = 107

16 Children, 107 Adults

Step-by-step explanation:

a + c = 123

7a + 5c = 829

a + c = 123

a = 123 - c

7a + 5c = 829

7(123 - c) + 5c = 829

861 - 7c + 5c = 829

861 - 2c = 829

-2c = 829 - 861

-2c = -32

-2c/-2 = -32/-2

c = 16

a + c = 123

a + 16 = 123

a = 123 - 16

a = 107

0.6

39mph

step-by-step explanation:

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.