Wipro Company Numerical Ability Ratio and Proportion

On a hotdog, the ratio of relish to ketchup is 3:4. The ratio of ketchup to mustard is 7:15.
I have 2 teaspoons of relish on my hotdog. How many teaspoons of mustard do I have on it, to the nearest teaspoon?
a)4
b)5
c)6
d)7
e)8

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Wipro Other Question

A is 5 times bigger than B. B is 2 units larger than 3C. D is 6 units less than C. Find D if A is 70.
a)17
b)15
c)12
d)6
e)- 2 The probability of me falling asleep in class is 10%. The probability of the teacher arriving late is 40%. What is the probability that I stay awake during the whole class but the teacher arrives late?
a)54%
b)50%
c)42%
d)36%
e)6%