book Maths Puzzle Numerical Ability

what is 8(4u-1)- 12u=11(2u-6)

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book Other Question

. Carlos and Mike agree race.Each leaves his own house at the same time and ride to the other’s house. A map of the race is shown. Carlos stays on the highway and averages 21 mp Mr. Merrill has 3 times as many nickels as dimes. The coins have a total value of $1.50. How many of each coin does he have? __nickels __dimes
must define varible and show w