Christopher tried this number trick

-write down ur street number

-multiply by 2

-add number of days in a week

-multiply by 50

-add the last two digits of ur phone number

-subtract number of days in a year

-add 15

Determine which line the error occurs

n represent any street number

1) 2n Multiply by 2

2) 2n+7 Days in a week

3) 100n+7 Multiply by 50

p represent last two numbers of phone number

4) 100n+7+p Add phone digits

5) 100n+p-358 Subtract days in a year

6) 100n+p-343 Add 15

Question

Mathematics

Jaylen Higgins

3 February, 17:50

Christopher tried this number trick

-write down ur street number

-multiply by 2

-add number of days in a week

-multiply by 50

-add the last two digits of ur phone number

-subtract number of days in a year

-add 15

Determine which line the error occurs

n represent any street number

1) 2n Multiply by 2

2) 2n+7 Days in a week

3) 100n+7 Multiply by 50

p represent last two numbers of phone number

4) 100n+7+p Add phone digits

5) 100n+p-358 Subtract days in a year

6) 100n+p-343 Add 15

+5

Answers (2)

Know the Answer?

Aliya Werner · Answer 1

The error occurs at step 3 when 2n + 7 is multiplied by 50. The result should have 100n + 350 which should be used for further calculations. But in step 3, it shows 100n + 7 which indicates the multiplication with 50 influenced only the first variable 2n and not the second one which was 7. Hence the calculation error occurred in step 3.

Gideon Lopez · Answer 2

The following steps are OK:

1) 2n Multiply by 2

2) 2n + 7 Days in a week

For this case the error occurs in the next step:

3) 100n + 7 Multiply by 50

The correct procedure is:

3) (2n + 7) * 50 = 100n + 350

answer:

line the error occurs is:

3) 100n + 7 Multiply by 50