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StepMaths Mock Paper 2 · Q20

Paper 2Number & counting

p,q,rp,q,r are positive whole numbers and pq+pr=80pq+pr=80, while pq+qr=425pq+qr=425. Given p,q,rp,q,r are prime, find the value of p+q+rp+q+r.

A2121
B4242
C9090
D2121 or 4242
E4242 or 9090

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