Question

10. The average of 30 results is 20 and the
average of other 20 results is 30. What is
the average of all the results?
(a) 24
(b) 26
(c) 28
(d) 21​

Answer 1

Answer:

24

Step-by-step explanation:

=30(20)+30(20)/50

=600+600/50

=1200/50

=24

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Answer 2

$\red{\bf {Answer:}}$

The average of the results is 24.

$\red{\bf {Step\:-by-\:step\: explanation:}}$

It is given that the average of 30 results is 20.

Total score of 30 results

$= 30\times 20$

Total score of 20 results

$= 20\times 30$

Total number of results

= 20+30=5020+30=50

Total score

= 600+600=1200600+600=1200

$Average=\frac{\text{Total score}}{\text{Total number of results}}$

$\boxed{\red{\sf Average=\frac{600+600}{50}}}$

$\boxed{\red{\sf Average=\frac{1200}{50}}}$

$\bold\color{green}{Average\: = \:24}$

Thankyou :)