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Find the difference between the total number of balloons manufactured on Tuesday and the total number of grey colour balloons manufactured on Monday.
460
510
290
300
None of the above
460
Use the common term (Purple) to equate ratios for Monday (3:4:2) and linear equations for Tuesday variables to solve quickly without complex algebraic expansion.
For Monday: Purple:Green = 3:4, Purple:Grey = 3:2, Total = 450. For Tuesday: Purple = 1.375 * Grey, Green:Grey = 9:8, Purple = Green + 40.
Total=P+G+Gr
Use the common term (Purple) to equate ratios for Monday (3:4:2) and linear equations for Tuesday variables to solve quickly without complex algebraic expansion.
Confusing the 37.5% increase with 37.5% of the total or miscalculating the base for the ratio on Tuesday.
Monday Balloon Calculation
Given ratios P:Gr=3:2 and P:G=3:4. The combined ratio P:G:Gr is 3:4:2. Sum of parts = 3+4+2=9. The value of 1 part = 450/9=50. Grey balloons (Gr) = 2├Ч50=100.
GrMonтАЛ=100
Tuesday Balloon Calculation
Let GrTтАЛ=8x, then GTтАЛ=9x. Since PTтАЛ=1.375├ЧGrTтАЛ, we get PTтАЛ=1.375├Ч8x=11x. Given PTтАЛтИТGTтАЛ=40, substitute the values: 11xтИТ9x=40тЗТ2x=40тЗТx=20.
x=20
Total Tuesday Balloons
Find individual counts: PTтАЛ=11├Ч20=220, GTтАЛ=9├Ч20=180, GrTтАЛ=8├Ч20=160. Total Tuesday balloons = 220+180+160=560.
TTueтАЛ=560
Final Difference
Calculate the difference between Tuesday total and Monday grey: 560тИТ100=460.
560тИТ100=460
A is correct because the total number of balloons on Tuesday is 560 and the number of grey balloons on Monday is 100, resulting in a difference of 460.
In Data Interpretation, always normalize ratios to a common variable (like P in Monday's set) before performing arithmetic operations to avoid calculation errors.