Rob's mobile tariff: Part II

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Rob's tariff for his mobile phone is shown below:

Calls cost 15p per minute anytime.

Texts cost 10p er text to any network.

In one particular month, the number of texts and calls were the same.

if the bill was £8, how many texts did he send


The answer is 32.

Callum Schafer by Callum Schafer , 22, United Kingdom

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2 solutions

Prasun Biswas
Jan 13, 2014

Let the no. of calls and texts be x x as they are both same as given in the question. Now, we have--

Total cost of calls = 15 x =15x and Total cost of texts = 10 x =10x . The sum of these costs is in paise. Given that the total costs of that month is £ 8 = ( 8 × 100 ) p = 800 p £8=(8\times 100)p = 800p . So, now we have,

15 x + 10 x = 800 ⟹ 25 x = 800 ⟹ x = 32 15x+10x=800 \implies 25x=800 \implies x=\boxed{32}

So, No. of texts sent in that month = x = 32 =x=\boxed{32}

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Fozley Abed
Dec 19, 2013

Let, the number of text=the number of calls=x, according to the question, we get - 0.15x+0.10x=8 or, 0.25x=8 or, x=32 (Ans )

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