Keep your brain young with this little quiz!!
I recently went to the shop and purchased 4 items.
Three of the items cost:
$1.50
$3.00
$4.00
There was quite a long queue, and as I was quite bored,
I was playing with my pocket calculator while I waited.
Very curiously, the 4 prices added to the same number
as I got when I multiplied the 4 prices together.
What was the price of the 4th item?
첫댓글 답은 비댓으로 해야 하나요?
굿모닝!
네..퀴즈답은 풀이와 함께 항상 비댓으로 ㅎ
비밀글 해당 댓글은 작성자와 운영자만 볼 수 있습니다.25.11.21 22:24
시호님 빙고!
비밀글 해당 댓글은 작성자와 운영자만 볼 수 있습니다.25.11.21 23:40
지피티야 수고했다! ㅎ
허나, 묘인님도 딩동댕!
8.5 plus x is y 라면
18x 도 y 라는 건가요?
답은 비댓으로
그렇지요.
즉, 8.5 + x = 18 X x 겠지요.. ㅎ
비밀글 해당 댓글은 작성자와 운영자만 볼 수 있습니다.25.11.22 07:15
석촌님 빙고!
역시..
Answer: $0.50.
The three prices add to 1.50 + 3.00 + 4.00 = 8.50.
The three prices multiply to 1.50 x 3.00 x 4.00 = 18.00.
You might be able to see that adding another 0.50 will take the total to 9.00,
and multiplying by another 0.50 will take the product to 9.00.
The answer can also be found using algebra.
If we call the missing price P, we have:
1.50 + 3.00 + 4.00 + P = 1.50 x 3.00 x 4.00 x P
8.50 + P = 18.00 x P
8.50 = 18.00 x P – P
8.50 = 17.00 x P
8.50 ÷ 17.00 = P
P = 0.50.