Amanda works as a carpenter and as a blacksmith.
She earns $$ 20$ per hour as a carpenter and $$ 25$ dollar per hour as a blacksmith. Last week, Giselle worked both jobs for a total of 30 hours, and earned a total of $$ 690$ dollar. How long did Giselle work as a carpenter last week, and how long did she work as a blacksmith?

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A carpenter constructed a rectangular sandbox with a capacity of 10 cubic feet. If the carpenter were to make a similar sandbox twice as long, twice as wide, and twice as high as the first sandbox, what would be the capacity, in cubic feet, of the second sandbox?

The correct option is D 80Let length, breadth and height of first box =lbhTherefore,lbh=10 cubic feetNew dimension of box: l1=2l,b1=2b,h1=2hNew volume =l1b1h1=2l.2b.2h=8lbh=8×10=80cubefeet

A carpenter constructed a rectangular sandbox with a capacity of $10$ cubic feet. If the carpenter were to make a similar sandbox twice as long, twice as wide, and twice as high as the first sandbox, what would be the capacity, in cubic feet, of the second sandbox?

The correct option is D $80$
Let length, breadth and height of first box $= l b h$
Therefore, $l b h = 10$ cubic feet
New dimension of box: $l^{1} = 2 l, b^{1} = 2 b, h^{1} = 2 h$
New volume $= l^{1} b^{1} h^{1} = 2 l .2 b .2 h = 8 l b h = 8 \times 10 = 80 c u b e f e e t$