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Phổ biến Word Problems >

The sum of three numbers is 79 . The second number is 2 times a number. The first number is 7 more than a number

Lời Giải

T h e s u m o f t h ree n u mb ers i s 79 . T h e seco n d n u mb er i s 2 t im es a n u mb er . T h e f i rs t n u mb er i s 7 m ore t han a n u mb er

Lời Giải

Kh \overset{o}{^} ng c \overset{o}{ˊ} nghi ệ m

Các bước giải pháp

Represent the numbers with

x, y, z

:

number 1 : x

number 2 : y

number 3 : z

A.T.Q.:

x + y + z = 79

y = 2 x

x = 7 + x

Giải hệ phương trình:

x + y + z = 79, y = 2 x, x = 7 + x :

Không có nghiệm

Kh \overset{o}{^} ng c \overset{o}{ˊ} nghi ệ m

Ví dụ phổ biến

5 less than the product of two and a number.Jack is twice as old as Lacy. In three years, the sum of their ages will be 54.how old will be lacy three years from now A number more than 2.the sum of two numbers is 22 and their hiệu is 12 Johnny is 26 years older than Ron. 10 years ago, Johnny was 2 times as old as Ron. Find Ron's present age.