Let Salil’s present age be x years. Then his mother’s age is 3x years. After 5 years, their ages total 70 years. Solving gives x equal to 15. Therefore, their present ages are 15 and 45 years.
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The perimeters are 4 cm, 6 cm, 8 cm, 10 cm and 12 cm respectively. When the side increases by 0.5 cm, the perimeter increases by 2 cm each time. This shows a linear pattern.