Question

How many more books do you need to read over the summer if you already read 4 books and you need to read a total of 16 books write an equation to represent the situation and solve the equation using mental math

A.16÷b=4;b=4 more books
B.4×b=16;b=4 more books
C.4+16=b;b=20 more books
D.4+b=16;b=12 more books

Answer 1

The answer is option (D). 4+b=16;b=12 more books

Explanation:

Step 1: Derive expression for total number of books to be read

The expression for the total number of books to be read is;

T=a+b.... equation 1

where;

T=total number of books to be read

a=total number of books already read

b=number of books not read

In our case;

T=16 books

a=4 books

b=unknown

replacing;

16=4+b

4+b=16...equation 2

solving;

b=16-4

b=12

You need to read 12 more books to reach your target