There are 600 children on a field. 30% of them were boys. After 5 teams of boys joined the children on the field, the percentage of children who were boys increased to 40%.
How many boys were there in the 5 teams altogether?
190​

Janette goes into an electronics superstore to buy a new computer. the salesperson works with her to find the right model, and she agrees to buy a new computer for $500 and a floor-model 18-inch monitor for $100. just when she is ready to pay, the salesperson walks away for a minute and then comes back to inform her that the monitor she was ready to purchase can't be sold for < $125. she agrees to the extra $25 even though they had initially agreed on the $100 selling price. janette has fallen for the technique of gaining compliance.