学年

教科

質問の種類

数学 大学生・専門学校生・社会人

年齢算の問題です。青ラインを引いた点についてなのですが、何故5人の年齢の和を半分に分けたものが1グループの年齢になるのですか?😭 この部分をもう少し詳しく教えて頂けませんでしょうか。

牛断昇 Who と When が大事! 11 頻出度★★☆☆☆ 重要度★★☆☆☆コスパ★★★☆☆ 現在および過去や未来の年齢について考える問題です。 誰のいつの年齢なのか を見失わないようにしましょう。 1年でみんな平等に1歳ずつ歳をとりますよ。 特別区Ⅰ類2006 PLAY1 年齢算の典型的な問題 両親と3姉妹の5人家族がいる。両親の年齢の和は、現在は3姉妹の年齢 の和の3倍であるが、6年後には3姉妹の年齢の和の2倍になる。また、4年 前には父親と三女の年齢の和が、母親,長女及び次女の年齢の和と等しかった とすると、現在の母親, 長女及び次女の年齢の和はどれか。 1.42 2.44 3.46 4.48 5.50 現在の年齢をxで表して、まずは6年後の年齢の関係で方程式を 立ててみよう! まず、前半の条件について、現在の3姉妹の年齢の和をxとすると、両親の 年齢の和は3xと表せます。 6年後には、両親は2人で12, 3姉妹は3人で18だけ年齢の和は大きくな り、このときの年齢の和について、次のように方程式を立てます。 6x2 6×3. 3x+12=2(x+18) m 3姉妹の6年後 両親の6年後. 3x+12=2x+36 ∴.x = 24 よって、現在の3姉妹の年齢の和は24、両親の年齢の和は3×24=72と なり、5人の年齢の和は 72 + 24 96 とわかります。 み歯

解決済み 回答数: 1
TOEIC・英語 大学生・専門学校生・社会人

自分の回答と照らし合わせて確認したいので、答えがなにになるかどなたか教えてください。 解説もあると助かります。

5 A Matter of Taste Reading Passage 042 At the age of just 22, Jamie Oliver became well known across the UK as "The Naked Chef." He called himself this not because he cooked wearing no clothes, but because he wanted to simplify food preparation so that everybody could follow his recipes. He wanted to "strip down" the idea of cooking. Since then he has had numerous TV shows, published 50 many books, and has become a household name in the UK. Today, one of the activities Jamie Oliver is best known for is his great effort to improve the school dinners that children eat every day. One day, he visited the kitchen of a typical London secondary school, and he was shocked to see how much processed junk food the kids were given to eat each day. Fat and sugar levels were extremely high, and nutritional values very 10 low. The "turkey twizzler" became the symbol of these unhealthy meals: processed meat containing 21.2% fat and only 34% actual turkey. Oliver ran the school kitchen for one year and tried to show that it was possible to serve healthy meals on a limited budget—and that kids actually enjoyed eating them. His mission was to radically change the eating habits of children in that school, and across the country. 150 200 15 20 25 CULTIES 250 His project (the "Feed Me Better" campaign) has had some influence on school dinners in the UK. After watching the documentary Jamie's School Dinners, 271,677 people signed a petition calling for healthier school meals. This led the Prime Minister to agree to spend 280 million pounds (about 37 billion yen) on school dinners, to ban some junk food from school menus, and to create a School Food Trust to provide support and advice for people preparing school meals. Research, by the way, shows that children who stop eating sugary, fatty food and instead eat Oliver's school dinners are better behaved in class, and they get higher test 300 scores, too. 350 Of course, the project has had some problems. At first, many students (and even parents) resisted the removal of the junk food they were so used to. In one famous instance, some parents were passing local takeaway food to their children through the school fence. Also, schools that followed the plan for a while were often found to gradually drift back into bad habits. After all, it is easier and cheaper to just give the kids junk food. However, Oliver's efforts represent a positive start, and with obesity becoming such a huge problem (see Unit 4), 400 it's a very necessary start.

解決済み 回答数: 1
1/6