GSCE Mathematics Problem Solving Algebra Higher Tier.

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Presentation transcript:

GSCE Mathematics Problem Solving Algebra Higher Tier

A mobile phone company’s latest package deal uses this formula D = R M A 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 £ 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

Answer A = M – = M (M-120) 21.4 = M M – = 0.04M = 0.04M M = 400 No. minutes used = 400