Answer:
18
Step-by-step explanation:
Note that 75% = 75/100 = 3/4, so 3/4 of the marbles must be blue. Let x be amount of blue marbles added. We can write an equation using this.
75% = 3/4 = (3 + x blue marbles)/(3 + 4 + 3 + x total marbles) = (3+x)/(10+x)
Multiplying by 4(10 + x) on both sides:
3(10 + x) = 4(3+x)
30 + 3x = 12 + 4x
18 = x
Therefore, we must add 18 blue marbles for 75% of the marbles to be blue.
I hope this helps! :)
Answer:
32.08488741
Step-by-step explanation:
Percent formula : is/of = %/100
is = 12
of = 60
% = x
now we sub
12/60 = x/100
cross multiply
(60)(x) = (12)(100)
60x = 1200
x = 1200/60
x = 20
check..
0.20(60) = 12
12 = 12 (correct)
so 20% of 60 is 12
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➷ Find the cost per pen by dividing:
300/10 = 30
It costs rs 30 for one pen
1 dozen = 12
2 dozens = 24
Multiply the values:
24 x 30 = 720
The cost of 2 dozen pens is rs 720
However, as it is asking for 'how much more' you have to subtract:
720 - 300 = 420
The cost is rs 420 more
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Answer:
wait what????
Step-by-step explanation:
