摘要：John is 12 years old now, Ruth (John's younger sister) is 5 years old. How many years later will John be twice as old as Ruth?

中国的英语课本几乎都是讲文学方面的术语及语法，很少涉及数学。

下面有两道英语数学题解释，请爱好者参阅！

(Question-1)

John is 12 years old now, Ruth (John's younger sister) is 5 years old. How many years later will John be twice as old as Ruth?

‌Solution‌:

Let "X" be the number of years after which John's age is twice Ruth's.

According to the problem, the equation is:

12 + X = 2(5 + X).

Solving the equation:

12 = 10 + 2X - X.

X = 2.(Answer)

That is to say:

2 years later, John will be 14, Ruth will be 7.‌ then John is exactly twice as old as Ruth.

(题一)

‌约翰12岁，露丝5岁。几年后约翰的年龄是露丝的两倍？

解:

设"X"年后，约翰的年龄是露丝的两倍，根据题意得出方程式:

12+X=2(5+X).

解此方程:

12=10+2X-X.

X=2.(答案)

验证:

两年后，约翰14岁，露丝7岁，恰恰是两倍。

(Question-2)

A three-digit dividend is divided by the largest two-digit divisor, resulting in a quotient of 6 and a remainder of 6. What are the dividend and divisor?

Solution‌:

Let the three-digit dividend be X.

According to the problem, the largest two-digit divisor should be 99. Using the division rule:

X ÷ 99 = 6 ...6.

X = 99 × 6 + 6 = 600.

Answer‌:

The three-digit dividend is 600.

The largest two-digit divisor is 99.

(题二)

一个三位数被最大的两位数相除，商为6，余数为6。求被除数和除数？

解:

设这个三位数为X，根据题意、最大的两位数应该是99. 根据除法规则得:

X➗99=6....6.

答案:

这个三位数的被除数是600.

这个最大的两位数的除数是99.

验证：

600 ÷ 99 =6…6。

(三)名词补充:

来源：鲲鹏展翅一点号