a pencil cost $(x-5) and an exercise book cost $(2x+10). If the sum of the cost of the two items is devided by 7, the result is $5.00. Calculate the cost of an exercise book.

Ok so first we need to find x. We know 7 × 5 is equal to 35. this means that the sum of the two items must add two 35. If we plug in 10, we will see that they will both add to 35.

x = 10

$(10-5) + $(20 + 10) which is the same as $5 + $30 which is $35.

Since we know they both add to $35 we can divide it by 7 to check it again, and we get $5.

Now to find the cost of only the exercise we just plug in 10 which is $(20 + 10). Do the exercise book is 30 dollars.

rspill6 rspill6 · Answer 2 · 2024-02-04T08:23:58+01:00

Answer:

The cost of an exercise book is $30.

Step-by-step explanation:

Pencil (P) = $(x-5)

Book (B) = $(2x+10)

If (P + B) is divided by 7, the result is $5.00

($(x-5) + $(2x+10))/7 = $5.00

$((x-5) + (2x+10))/7 = $5.00

$((3x+5)/7 = $5.00

$(3x+5) = $35.00

$3x+ $5 = $35.00

$3x = $30.00

x = $10.00

B = $(2x+10)

B = $(2*($10.00) + 10)

B = $30

An exercise book costs $30

A pencil costs $($10.00 - 5) or $5.00 [The metric term is Ouch]

Check:

Does the sum of the two ($30.00 + $5.00) equal 5 when divided by 7?

35/7 = 5 YES

a pencil cost $(x-5) and an exercise book cost $(2x+10). If the sum of the cost of the two items is devided by 7, the result is $5.00. Calculate the cost of an exercise book.​

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a pencil cost $(x-5) and an exercise book cost $(2x+10). If the sum of the cost of the two items is devided by 7, the result is $5.00. Calculate the cost of an exercise book.