In a box, the ratio of the number of red marbles to that of blue marbles is 4 :7. Which of the following could be the total number of marbles in the box?
(a) 14
(b) 21
(c) 22
(d) 28
Solution:
If a, b, c and d are in proportion, then
(a) ab = cd
(b) ad = be
(c) ac = bd
(d) none of these
Solution:
If the weight of 5 bags of rice is 272 kg, then the weight of 1 bag of rice is
(a) 50.4 kg
(b) 54.4 kg
(c) 54.004 kg
(d) 54.04 kg
Solution:
More Solutions:
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- Look at the following matchstick pattern of letter A.
- If the side of an equilateral triangle is 1
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