Mathematics

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• Troops
There are two leaders in the tourist group, with an average age of 30 years and several children with an average age of 10 years. The total age of the group is 12 years. How many children are in the group?
• Bent scale
Monica weighed 52 kg. Sara 54 kg. Together they weighed 111 kg. They noticed that the weight on the scale was bent. How much did they really weigh?
• A swiming
A swiming pool holds 30000lt of water. How many gallons does it hold? 1 gallon= 4.55lt
• Outside tangents
Calculate the length of the line segment S1S2 if the circles k1 (S1, 8cm) and k2 (S2,4cm) touch the outside.
• Corona again
If the population on long island is 7.75 million and the coronavirus has affected 22,178. What percent of the population is affected. (looking for 1 in? If possible)
• Compute 4
Compute the exact value of the area of the triangle with sides 14 mi, 12 mi, and 12 mi long.
• The freezer
1. The temperature inside a freezer is minus 23 degree Celsius. The temperature falls by a further 12 degree degree Celsius. What is the new temperature? 2. What is the difference between temperatures of 12 degree Celsius and 210 degree Celsius?