Tata Iron and Steel Company (TISCO) was founded by Jamsetji Nusserwanji Tata and established by Sir Dorabji Tata on 26 August 1907. TISCO started pig iron production in 1911 and began producing steel in 1912 as a branch of Jamsetji's Tata Group . The first steel ingot was manufactured on 16 February 1912. By 1939, it operated the largest steel plant in the British Empire. The company launched a major modernisation and expansion program in 1951. Later, in 1958, the program was upgraded to 2 million metric tonnes per annum (MTPA) project . By 1970, the company employed around 40,000 people at Jamshedpur, and a further 20,000 in the neighbouring coal mines .
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7 years ago, the ratio of the ages of A and B was 1:2 and after 7 years it will become 3:5. Find their present ages.
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