exam Maths Puzzle Numerical Ability

Find the number of terms and the sum of the series 7+17+27+...+107

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exam Other Question

Nabuko makes and sells key chains. It cost her $0.75 to make one key chain and she sells the key chains for $1.25 each. She would liek to make at least $300.00 inprofit from sell PLease help me solve these 4 linear equations

x-4<-6

x+12<-5x

2x+3>x-1

7-5x<22