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AnnZ [28]
3 years ago
12

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

Mathematics
1 answer:
IgorC [24]3 years ago
8 0
81.
x \times 1.5 + x \times 2.5 +  \frac{x}{2}  \times 4 + ( \frac{x}{2}  + 1) \times 3 = 78 \\ 4 \times x + 4 \times  \frac{x}{2}  + 3 \times  \frac{x}{2}  + 3 = 78 \\ 4 \times x + 7 \times  \frac{x}{2}  = 75
multiply everything with 2
8 \times x + 7 \times x = 150 \\ 15 \times x = 150 \\ x =  \frac{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)\times  \frac{1}{4}  + x \times  \frac{1}{2}  = 11.75
multiply with 4
x + 2 + 2 \times x = 47 \\ 3 \times x = 47 - 2 \\ 3 \times x = 45 \\ x =  \frac{45}{3}  \\ x = 15
x is the amount of half dollars in the pile of coins. do the calculations for the quarters.

86.
3 \times x + 2 \times x + x = 24 \\ 6 \times x = 24 \\ x =  \frac{24}{6}  \\ x = 4
x is the amount of peaches cans, do the calculations for the rest.
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