{"id":"dat-tch-field-trip-per-student","audience":"teachers","category":"data","technique":"context","title":"Work out a field trip's per-student cost after a PTA gift","free":false,"task":"You need the per-student cost for the science museum trip permission slip. At last night's meeting the PTA committed $300 toward the bus (not in your notes). 50 students are going. Write exactly 3 numbered lines (bus share, admission, per student), each with the math, then one unnumbered last line with what the school fund pays for 4 fee waivers. Plain text, under 60 words.","materialLabel":"Your trip planning notes (attached to your prompt automatically)","material":"SCIENCE MUSEUM TRIP - Grade 6 (Thurs, Dec 4)\n\nQuotes:\n- Bus (Gold Line Coaches, 1 bus, 56 seats): $650 round trip\n- Museum student admission: $8 each\n- Museum: teachers and chaperones free (up to 1 per 10 students)\n\nStudents:\n- 50 students signed up\n- 4 have fee waivers (school activity fund covers their full cost)\n\nNotes:\n- Last year's slip said $20 per student. Bus was cheaper then.\n- Planetarium show is an extra $3, but we're skipping it.\n- Lunch: students bring their own.\n- Need 5 chaperones; have 3 so far.\n- Permission slips go home Monday and are due back Nov 21.\n- Families who can't pay should contact the front office privately.\n- Principal approved the trip at the staff meeting.\n- Buses leave at 8:45 and return by 2:30.","rules":[{"type":"numberedItems","count":3},{"type":"plainText"},{"type":"maxWords","max":60}],"mistakes":[{"title":"Not mentioning the PTA gift","why":"The AI splits the full $650 and charges families $21.","fix":"Add: \"PTA pays $300 of the bus.\"","checks":["r0","r1"]},{"title":"Not asking to see the work","why":"Families and the office will ask how you got the number.","fix":"Add a line to copy: \"1. Bus: ($650 − $300) ÷ 50 = $7\"","checks":["numberedItems","r0"]},{"title":"Forgetting the waivers","why":"The AI doesn't tell you what to request from the school fund.","fix":"Add: \"Last line: waiver cost for 4 students.\"","checks":["r2"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each line: \"each line under 12 words.\"","checks":["maxWords"]},{"title":"Forgetting where it goes","why":"AI loves markdown tables and bold, which show up as clutter in a permission slip.","fix":"Add: \"Plain text, no bold, headings or tables.\"","checks":["plainText"]}],"promptHints":[{"label":"Mentions the PTA gift","patterns":["pta","\\$?300"]},{"label":"Gives the student count","patterns":["\\b50\\b"]},{"label":"Asks to show the math","patterns":["show (the |your )?(math|work)","x \\$|\\bx\\b.{0,10}=","calculation","step"]},{"label":"Asks about waivers","patterns":["waiver","school fund"]},{"label":"Asks for plain text","patterns":["plain","no bold","no markdown","no formatting","no (headings|tables)"]}],"hint":"Your notes don't have last night's PTA gift. Tell the AI and ask for each step of the per-student math.","rubricLabels":["Bus share subtracts the PTA gift: ($650 − $300) ÷ 50 = $7","Admission is $8 and per-student cost is $7 + $8 = $15 (no planetarium, not last year's $20)","The last line gives the school fund's waiver cost: 4 x $15 = $60, and nothing comes before the first numbered line"]}