Let x be the amount of cement and y be the amount of sand. If <span>the ratio of cement to sand for mortar is 1:3, then
and y=3x.
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So, if <span>Sandy puts in x=7 shovels of cement, then she puts
shovels of sand.
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Answer: 21 shovels of sand.
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I guess you are asking what is the shape of the cross section.
It will be an ellipse.
Let the numbers be x and y.
by the first statement of the question, we get , x + y = 30.,,..(1)
by the second satement, we get , x = y+ y => x=2y... (2)
from equation (2), let us put the value of x in equation (1),
x + y = 30
=> 2y + y = 30
=> 3y = 30
=> y =30/3
=> y = 10
and x=2y => x = 2*10 = 20
in short, the numbers are 10 and 20
I am not sure about the probability but I cant tell you these events are independent because u don't need to roll a five for a coin to land on heads
49 ÷ 100
= 0.49
0.49 x 100 = 49%