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Phổ biến Word Problems >

Five years ago, Alice was twice as old as Bob. If Alice is now 30 years old, how old is Bob?

Lời Giải

F i v e ye a rs a g o, A l i ce w a s tw i ce a s o l d a s B o b . I f A l i ce i s n o w 30 ye a rs o l d, h o w o l d i s B o b ?

Lời Giải

Bob^{'} s age is : 17 \frac{1}{2}

Các bước giải pháp

Translate the problem into an equation:

2 (x - 5) = 30 - 5

Giải

x, 2 (x - 5) = 30 - 5 : x = \frac{35}{2}

Chuyển phân số không thực sự thành hỗn số:

17 \frac{1}{2}

Bob^{'} s age is : 17 \frac{1}{2}

Ví dụ phổ biến

two more than the product of a number and 3 equals 6 two less than the square root of a number is 5 10 less than 2/5 of a number is 70. What is the number?The sum of a number and its square is 110. find the number The sum of three consecutive integers is 189. Find the integers.