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Published byCornelius Bradley Modified over 8 years ago

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GSCE Mathematics Problem Solving Algebra Higher Tier

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A mobile phone company’s latest package deal uses this formula D = R + 0.01M + 0.03A D – the monthly bill R – the monthly rental including free unlimited texts M – number of minutes on calls per month A – number of minutes spent online per month Dafydd knows he spent 120 minutes less online than on calls one month. The rental charge is £9 and the monthly bill was £21.40. He wants to know how many minutes he spent on calls. Write an expression for A in relation to M. Substitute this and all the data into the formula and rearrange to find M. Helping hand

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Answer A = M – 120 21.4 = 9 + 0.01M + 0.03(M-120) 21.4 = 9 + 0.01M + 0.03M – 3.6 21.4 = 0.04M + 5.4 16 = 0.04M M = 400 No. minutes used = 400

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