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These resources are designed to help you familiarize yourself with the exam format, identify key topics, and practice effectively. Whether you're preparing for the May/June or GCE sessions, our curated materials provide both objective and theory questions to enhance your study sessions.","tags","waec nigeria west africa examination council","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",18,"createdOn",1755991949910,"updatedOn","questionsCount",27220,"courseCount",23,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"mLvl3rJ9XYpCiPFCRdLx3enEz8uiZ1","q","A casting is made up of Copper and Zinc. If 65% of the casting is Zinc and there are 147g of Copper. What is the mass of the casting?","ans",[414],1,"2010","course","mathematics","exp","%Zinc + %Copper = 100%
\n
\n65% + %Copper = 100%
\n
\n%Copper = 100% - 65% = 35%
\n
\n%Copper = \\(\\frac{\\text{Mass of % Copper}}{\\text{Mass of Casting}}\\) x 100%
\n
\nMass of Casting = \\(\\frac{147}{35}\\) x 100%
\n
\n= 420g","opts",[422,423,424,425],"320g","420g","520g","620g",7,"7","initComment","initReply","actionData","errors"]

WAEC - Mathematics (2010 - No. 7)

Explanation

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