book Maths Puzzle Numerical Ability

a jar contains 5-gram bolts and 10-gram bolts. the contents of the jar weigh 2.35 KG (1000g=1KG). if there are 300 bolts altogether, how many are there of each kind?

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book Other Question

whats the area of a sector in a circle if the circle has radius 4 cm and the arc has a measure of 120 degrees? MR.SELL BOUGHT THREE DOGHNUTS AND A 44-OUNCE THERMAL CUP OF COFFE ONHIS WAY TO SCHOOL. IF THE COFFE COST WAS $1.95 AND THE TOTAL OF HIS PURCHASE [BEFOERE TAX] WAS $3.60, HOW MUCH DID EACH DOUGHNUT COST?