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At first, John had 1200 marbles and Mary had 500 less marbles than him. Each of them gave away an equal number of marbles to Kelly. In the end, Mary had half as many marbles as John. How many marbles did each of them give away?
A few weeks ago, it was observed that there were 255 street lights in locatlity X and 615 street lights in locality Y. Recently, an equal number of street lights were installed in both the localities. Subsequently, the number of street lights in locality Y was found to be two times the number in locality X. How many new street lights were installed in each locality?
Container B had 312 kg of rice less than container A which had 324 kg of rice. An equal amount of rice was added to each container. As a result, container B had `1/4` of the quantity of rice in container A. What was the quantity of rice added to each container?
Jane's container of rice had a mass of 5.4 kg. Joel's container of rice had a mass of 7.8 kg. The amount of rice in Jane's container was `1/7` that in Joel's container. (a) What is the mass of rice in Jane's container? (b) Find the mass of an empty container. (Note: both containers are identical) ...
The total mass of a box with 25 chemistry textbooks is 32 kg. An identical box with 40 physics textbooks has a mass of 38 kg The mass of a physics textbook is `3/4` that of a chemistry textbook. (a) Find the total mass of 3 chemistry and 6 physics textbooks. (b) What is the mass of the box? ...