For the following questions answer them individually
What should come in place of the question marks in the following equations?
$$\frac{?}{24}=\frac{72}{\sqrt{?}}$$
If the height of a triangle is decreased by 40% and it’s base is increased by 40% , what will be the effect on its area?
In 1 kg of a mixture of sand and iron, 20% is iron .How such sand should be added so that the proportion of iron becomes 10%
The denominator of a fraction is 2 more than thrice it’s numerator.If the numerator as well as denominator are increased by one,the fraction becomes ⅓ .what was that the original fraction?
In the following some of the combinations of operations and an operand
A: means ‘÷3’
B: means ‘x3’
C: means ‘-3’
D: means ‘+3’
E: means ‘÷2’
F: means ‘x2’
G: means ‘-2’
H: means ‘+2’
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