Problems And Answers PHIMO MOCK 2020 SECONDARY 1

11. The cost of 9 milk shakes, 1 order of fries and 5 hamburgers at a certan fast food restaurant is $39.50. At the same restaurant, the cost of 3 hamburgers, 5 milk shakes, and 1 order of fries is $23.50. What is the cost(in dollar) of 2 milk shakes, 2 hamburgers, and 2 order of fries at this restaurant?

12. There are 120 members in a Zoom meeting. 40% of them are boys. The head of the meeting would like to tune the percentage of boys to 30%. How many girls are need to be added?

13. A 4-digit number has a remainder 4 when divided by 11,9 and 5. What is the maximum value of this number?

14. Carl have a list of real numbers, whose sum is 40. If Carl replaces every number \(x\) on the list by \(1 – x\), the sum of the new numbes will be 20. If instead Carl had replaced every number \(x\) by \(1 + x\), what would be the sum?

15. At a party, every two people shook hands once. How many people attended the party if there were 66 handshakes.