Question

Altogether, Tim, Laura, and Eric worked 210 hours campaigning for their friend Jake who was running for the senate. Laura worked 10 hours more then Tim, and Eric worked twice as many hours as Laura. How many hours did Laura work on the campaign?​

Answer 1

$Let \: x \: be \: the \: time \: which \: Laura \: worked \\ The \: time \: Tim \: worked:x - 10 \\ The \: time \: Eric \: worked:2x \\ We \: have \: an \: equation:x + x - 10 + 2x = 210 \\ < = > 4x = 220 \\ < = > x = 55 \: (hrs) \\ So \: Laura \: worked \: for \: 55 \: hours \: on \: the \: campaign.$