Question

Andrew wants to place grouping symbols in the expression
15 + 25 – 18 ÷ 2 so that it has a value of 18.5.

Which shows the correct placing of the grouping symbols?



A.(15 + 25) – 18 ÷ 2

B.15 + (25 – 18 ÷ 2)

C.15 + (25 – 18) ÷ 2

D.15 + 25 – (18 ÷ 2)

Answer 1

@Willie579

Answer 2

Well this seems pretty easy. I'll try to figure it out. c:

Answer 3

ok

Answer 4

What the question is saying is find out how to group it where it 's value is 18.5. So let's go through the possible answers and answer them to see if we get 18.5.

Answer 5

For A.
(15 + 25) – 18 ÷ 2
(40) - 18 ÷ 2
40 - 18 ÷ 2
40 - 9
=31

Answer 6

So A is incorrect.

Answer 7

On to B.

Answer 8

ok hehe

Answer 9

15 + (25 – 18 ÷ 2)
15 + (25 - 9)
15 + (16)
15 + 16
=31

Answer 10

NOTE: To do this you must use the PEMDAS rule.

Answer 11

ok got you

Answer 12

Parenthesis, Exponents, Multiplication*, Division*, Addition**, Subtraction**
(Please excuse my dear aunt Sallie!)
*Multiplication or Division which ever comes first in the problem ** Addition or Subtraction which ever comes first in the problem

Answer 13

So anyways, on to C.

Answer 14

15 + (25 – 18) ÷ 2
15 + (7) ÷ 2
15 + 7 ÷ 2
15 + 3.5
=18.5

Answer 15

So C is the answer.

Answer 16

yayyyyy

Answer 17

No problem! :)

Answer 18

i got another a question

Answer 19

Okay, no problem! :)

Answer 20

What's your question?

Answer 21

@WildQueen