Let the number of chemistry books be x and the number of calculus books be y
total number of books in each case is:
x+y=24
x=24-y.....i
Weight of each case:
2707.2/20
=135.36
thus
4.2x+6.0y=135.36..ii substituting i in ii
4.2(24-y)+6y=135.36
100.8-4.2y+6y=135.36
hence
1.8y=34.56
y=19.2
hence
x=24-19.2
x=4.8
thus the number of chemistry books was 4.8*20=96 number of calculus was
19.2*20
=384 books
Answer:
575.4 sq inches
Step-by-step explanation:
you can divide this shape into:
13 x 13 square
trapezoid with bases of 13 and 30 with a height of 20
semi-circle with radius of 15
A(square) = 169
A(trapezoid) = 53
A(semi-circle) = 353.4
Answer: cost to buy 7.4 pounds of avocados from this store=$17.39
Step-by-step explanation:
Sale of avocados per pound in the grocery= $2.35
Sale of 7.4 pounds of avocados= $2.35 x 7.4 pounds =$17.39
Therefore, the cost to buy 7.4 pounds of avocados from this store=$17.39
Combine like terms.
2x+20=3x-5
20=3x-5-2x
20+5=3x-2x
25=x
Answer:
$.19 per ounce or 19 cents per ounce
Step-by-step explanation:
divide the dollars by the ounces
$4.59 /24 oz
$.19125/ oz
