Mary’s recipe for cake is 360g of sugar mixed with 45g of cocoa. Mary used 240g of cocoa to make cake for her son’s birthday. How much sugar would have been added by Mary to make that birthday cake?

Please attempt the above question, timed and then click below to reveal the few second technique leading to the correct answer

Hours:Minutes:Seconds
00:00:00

HINT: Students / Children! Please recognise that 8 × 45 = 360.
Step 1. 8 × 45 = 360 8 times more sugar used than cocoa
Step 2.   Therefore amount of sugar needed = amount of cocoa used × 8
8 × 240

Time allowed: 30 seconds

Time taken using the technique: 3 seconds

Time saved = 27 seconds [9/10th (90%) of time allowed by examiner]

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WORK SHEET – Practice question

Ajit’s recipe for cake is 270g of sugar mixed with 45g of cocoa. Ajit used 72g of cocoa to make cake for his daughter’s birthday. How much sugar would have been added by Ajit to make that birthday cake??