Question

Can anyone please help me with problems 81, 83, and 86? PLeASE and THaNK YOU!

Answer 1

81.

`x * 1.5 + x * 2.5 + (x)/(2) * 4 + ( (x)/(2) + 1) * 3 = 78 \\ 4 * x + 4 * (x)/(2) + 3 * (x)/(2) + 3 = 78 \\ 4 * x + 7 * (x)/(2) = 75`
multiply everything with 2

`8 * x + 7 * x = 150 \\ 15 * x = 150 \\ x = (150)/(15) \\ x = 10`

x is the number of 1.50 and 2.50 wrenches he bought. do the calculations for the rest of them

83.

`(x + 2)* (1)/(4) + x * (1)/(2) = 11.75`
multiply with 4

`x + 2 + 2 * x = 47 \\ 3 * x = 47 - 2 \\ 3 * x = 45 \\ x = (45)/(3) \\ x = 15`
x is the amount of half dollars in the pile of coins. do the calculations for the quarters.

86.

`3 * x + 2 * x + x = 24 \\ 6 * x = 24 \\ x = (24)/(6) \\ x = 4`
x is the amount of peaches cans, do the calculations for the rest.